Official Windows 10 ISO files now available for download

Microsoft has unleashed Windows 10 onto the world, and if you were looking to perform a clean install instead of upgrading from Windows Update, the Redmond giant has made ISO files available for download. ISOs are listed for Windows 10 Home and Pro versions.

Before you go ahead with the download, ensure you have the following:

  • An internet connection (internet service provider fees may apply).
  • Sufficient data storage available on a computer, USB or external drive for the download.
  • A blank USB or DVD (and DVD burner) with at least 4 GB of space if you want to create media. We recommend using a blank USB or blank DVD, because any content on it will be deleted.
  • Read the System Requirements (opens in new tab).
  • If you will be installing the operating system for the first time, you will need your Windows product key (xxxxx-xxxxx-xxxxx-xxxxx-xxxxx). For more information about product keys and when they are required, visit the FAQ (opens in new tab) page.

You can run the following command in CMD to find the product key associated with your Windows installation: wmic path softwarelicensingservice get OA3xOriginalProductKey.

Customers interested in Enterprise editions can download the ISOs from the MSDN Subscriber Downloads{.nofollow} page. Head down to the link below to grab the ISOs, and while the files download, make sure you read our comprehensive Windows 10 review.

Download Windows 10 ISOs (opens in new tab)

Thanks everyone for the tips!

345 Comments
  • I have the TP and want to clean install? Do I still need a product key?
  • Yes, you need a key unless you don't enable receiving preview builds once you've reinstalled.
  • Hey I also have a question... im running build 10240 with all the updates theyve pushed out so far......still no sign for oficial WIn10... i keep hitting update (no response)
  • It is oficial.
  • You are already running it.  10240 is it.
  • Lol now they release the ISO just when I am in the progress of the upgrade
  • Same here! I'm on Mountain Time...
  • Why does that matter?
  • Clean installs are generally considered a better idea
  • this link from MS should explain eveything you need to know about installation / upgrade   http://answers.microsoft.com/en-us/insider/wiki/insider_wintp-insider_in...
  • Hello, can you put the produt key from the licenced windows 7 i have on the computer?
  • If you are running a genuine copy of W7 sure u can!
  • What if its not geniune?
  • Then it will not activate!!!
  • Windows activator.
  • How does Windows activator works?
  • Then hang your head in shame
  • You can't just "put the key"....to get Windows 10, you MUST have Windows 7 or 8.1 already installed and use Windows Update to get 10.  THEN you could do a clean install if you need to, but the initial install MUST be over a working system.
  • I call bullshit - That would defeat the purpose of using the ISO in the first place. The whole point of a clean install is that you can retain the original OS if you want - which is exactly what I did with Windows 8, retaining W7 on a separate drive. Sure you initiate the upgrade from the prior OS but you definitely don't perform an upgrade just to do a clean install.
  • I'm about to do a clean install using a Windows 7 key that hasn't been upgraded, I'll let you know how it turns out so we can have a confirmation either way.
  • I've just done this on a SP2 and like Lee suggested, it did not work. It asked me for the key twice during setup, both times I selected "skip" or "do this later". Windows installed just fine but it is not activated and the install-key displayed is different from the one it was previously running. I called support and they told me the same thing, you have to first upgrade from the existing OS and your key will at that point be upgraded to a Win 10 key. Future clean installs will then work just fine. So now I'm downloading a Win8.1 ISO to do a rollback only to then let that run through an in-place upgrade before I nuke the drive and do yet another clean install... Geez. You'd think they could have rolled out a web-based tool for key upgrade and verification.
  • how could you u tell how to confirm that my pc is downloading the iso? as i see no icon in the taskwar now?
  • EDIT: Double post.
  • This has all the info I need. I suspect they make you take this route so that your "Free Windows 10 Key" is tied to your current hardware. Should you build a new PC in the future, that "Free Windows 10 Key" will no longer work, and you will have to pay the license fee for a new one. I too was hoping to install Windows 10 using my Windows 7 key to prevent any marrying of the hardware so that I would have a Windows 7 and Windows 10 key to use forever on whatever I wanted. Microsoft is smart enough to see the lost revenue there I guess.  
  • No, that is only true if your current Windows is tied to hardware (i.e. an OEM version). Your windows 10 key will be tied to the same licensing as your previous key.
  • How did it go?
  • Got called into a meeting just a few seconds before I got a chance.  Just got back to my desk - did not go well:  The product key you entered didn't work.  Check the product key and try again, or enter a different one.  Error Code: 0xc004f050 (Invalid Key)
  • Sounds about right. So they are linking your hardware to the free Windows 10 key when you do the upgrade, when then allows you to do a clean install later if you so choose. I just wish I knew exactly what hardware information they are linking so I know what hardware NOT to upgrade rendering my free copy of Windows 10 useless. My best guess would be the motherboard.
  • Direct from MS. You're using a product key to upgrade to Windows 10, but a previous version of Windows wasn't installed on your PC. To update, you need to have Windows 8 or Windows 7 already on your PC. If you formatted or replaced your hard drive, you won't be able to use a product key to update to Windows 10. You'll need to install your previous version of Windows, and then reinstall Windows 10. http://windows.microsoft.com/en-us/windows-10/why-activate-windows-10
  • That is correct. Microsoft want to nuke all Windows 7/8 clients so they don't have to support those lines. Those are now dead ends. On the other hand, Windows 10 will go on forever being constantly updated.
  • Microsoft did this to make it easier to make it so you don't have to enter a key to do a clean install. Instead if you are eligible for the upgrade Windows 10 gets activated during the upgrade and stores you hardware configuration on MS's servers and when you do the clean install it verifies your Clean Install is activated without your interaction and proceedes with the clean install.  
  • This needs to be higher up. Make a post in the forum about this helpful tip. Thanks!
  • How to clean install after the upgrade from Windows Update ? 
  • Awesome.... Was waiting for this....
  • What is the product key that I have to insert?
  • The Product key of OS ( W 7/8.0/8.1 ) which you are running now..
  • Mine is not genuine
  • That's your fault buddy, pay like the rest of us next time.
  • LOL
  • hahaha! when you bought a PC you got a Free OS. i got Windows Vista so i have to pay too.
  • Walk into walmart and pulled the key of display lol
  • Also make sure you download the right Windows 10 for the type of 7/8/8.1 you own (ie Home / Pro) last I checked, if you install pro and only have Home version of an older OS, it won't recognize your key
  • You don't insert a key...you MUST upgrade a running system FIRST.  Then you can do a clean install if you want.
  • You're wrong, this ISO is for clean installs, is like if you purchased a Windows 10 DVD in the store.
  • You can use an ISO to clean install OR upgrade. I used it last night to upgrade my PC and I have no issues. Get your facts straight.
  • I tried using the iso to do an upgrade at lunch and it asked for my key, didn't have time to look it up.  Do you remember when you upgraded your PC with the iso if it asked for your 7/8/8.1 key or it just upgraded?
  • There's a 98% chance you downloaded the incorrect ISO for your OS. It should not ask for a key when you use the correct version.
  • Hmm... it is 8.1 x64 Pro and I am using x64 Windows 10 Pro iso so I don't think it is that.
  • The free upgrade does not apply to 8.1 Pro.
  • @TJD You're super wrong. W8.1 Pro can upgrade to W10 Pro for free.
  • Turns out my problem was trying to do the upgrade of an .iso or created USB installer, running it from either of those will ask you for the key.  The trick is to run the Media Creation Tool, but then instead of creating and .iso or USB, select "Upgrade this PC now"
  • All you had to do is click "skip this" where it asks for the key.
  • "All you had to do is click "skip this" where it asks for the key." There is no 'skip this' option, only back or next and neither are selectable, and even if there was a 'skip this' it would have just skipped it and then I would have had an inactivated Win 10 with no way to activate.
  • h
  • While what you're saying is technically correct, your previous key will not activate Win10, hence the upgrade before clean install. Once you've upgraded you can do as many clean installs using that key as you like.
  • Thanks for the response, I am upgrading to Windows 10 now, after it finishes I'll obtain the new License key for Windows 10 and format my hard drive to perform a clean install.
  • Microsoft Says :: Can I reinstall Windows 10 on my computer after upgrading?
    Yes. Once you’ve upgraded to Windows 10 using the free upgrade offer, you will be able to reinstall, including a clean install, on the same device. You won’t need a product key for re-activations on the same hardware. If you make a meaningful change to your hardware, you may need to contact customer support to help with activation. You’ll also be able to create your own installation media like a USB drive or DVD, and use that to upgrade your device or reinstall after you’ve upgraded
  • Read the article, it tells how to obtain the key.
  • What would be the difference in clean installing & updating existing os.
  • If you don't know, then take the upgrade option. A clean usual means blowing away everything on your computer and starting fresh (obviously after backing up your data first).
  • Your first install on a machine HAS TO BE an upgrade.  Only after doing an upgrade can you do a clean install.
  • Question: I don't have to upgrade from windows 8.1 before I perform a clean install?
  • I have the same question, do I need to upgrade?
    My device has my Windows 8 license embedded in the BIOS (Laptop) and I can do a clean installation of Windows 8.1
  • That's a good question. It has been said from the beginning that yes, an upgrade from W7/8.1 was going to be performed at least once before a W7/8.1 key could be used to perform a clean install of W10. But for what I am reading now here and in the Microsoft FAQ it seems that that's no longer the case, and you can use an old key directly to do a clean install. Anyone can confirm?
  • That's what I read before. Perhaps I should download the ISO and initiate the upgrade from there and then perform a clean install afterwards. :(
  • Link?
  • I don't understand why this is STILL a question.  It has been stated time and again.  YOU MUST UPGRADE FROM 7 or 8 TO GET THE FREE UPGRADE.  Then you can do a clean install if you want.
  • Because nobody explains WHY it works this way. I don't want to do an upgrade. I want a clean install. Also, my Windows 7 Pro is not OEM, so I can install it as many times as I like, on whatever hardware I like, as long as it's only installed on one PC at a time. If I do an upgrade to Windows 10, the activation is tied to that particular hardware. Where do I get the activation key for Windows 10 that is the equivilent of my Windows 7?
  • Apparently this is because once the upgrade completes, a new key is generated and stored along with your machine ID in Microsoft's cloud. In this way, a clean install does not require entering an explicit key.
  • There is a big difference between *initiating* the install from an earlier OS, versus overwriting that earlier OS to W10. If it works like any of the previous upgrade offers, you can initiate the process but not overwrite your current OS by doing a clean install to a different drive. I did that before and effectively had W7 and W8 available to me (same PC, different drives).
  • Mate, you are all over this article chanting the same thing, give a reference artical or something to back up what you are saying and maybe people will stop ignoring you. I'm not sure how it works but I can't see the point in a clean install if you have to upgrade first - not saying you're wrong just that I don't see the logic behind it!
  • The logic is that your existing key needs to be "upgraded" to a Win10 key as well. Why on earth they have not automated this process I don't know, but they haven't and Win10 will not, currenly, activate with a Win7/8.1 key. Just gone through this scenario and I'm not having to reinstall 8.1, upgrade and then do a clean 10 install. Spoke to support, that's the way forward at this point. Some keys, retail from my understanding, will activate fine, but keys from previous pre-installed operating systems will not (ie. just about any store bought PC).
  • Alright folks, here's an update: YES, we must upgrade from the previous version (w7, w8, w8.1) to w10 EVEN if we using the ISO for the first time! Cause what I noticed after I upgraded my SP3, the key is different compared to the w8.1's key. I've jot down the new w10 Pro key for clean install. All the best and let's enjoy win10 to the MAX!!
  • If my new Dell desktop gets here as it is supposed to today, would this take care of any bloatware on the device and get me that "Microsoft Experience" or whatever the PR term is install if I had gotten it from the MS Store (got this from the Dell store).  It's not a Windows 10 desktop despite the arrival date, they have just taken their sweet time getting it to me.  Thanks.
  • If you install windows 10 fresh not upgrade then yes it will over right every single thing on your computer.
  • Meanwhile I'll wait a lil more for the keys to become publicly available.
    Don't judge me
  • I am going to judge you in 3...2...1
  • That hasn't worked since Windows XP. All keys are verified now. Since Windows 8 you've been unable to patch the OS to prevent verification.
  • It has ALWAYS worked, even easier/better than XP ;)
  • LOL :)
    It works! MSFT can do all the verification they want, loopholes still exist.
  • Why are you telling us that? It seems like you think you are better than us.
  • I'm judging you for not even having the $15 that Windows 8 was offered at, for at least 6 months!
  • ISO files can be downloaded by anyone right? Is it just for insiders again who using windows 10 build bcoz I had rolled back from win 10 builds to 8.1 back few months back.
  • Anyone.
  • If you ever had 10 on your system, then it is registered for 10, provided you were using a legal key for 8.1.
  • Including on Dreamspark too?
  • They're publicly available.
  • In Dreamspark I have from Windows 7 to 8.1 and 10 is Technical Preview.
  • Well obviously dreamspark is not updated yet than :P Checked 10 minutes ago and found out the same. Dont need it anyways except of the key that might come up there - just to have a genuine one :)
  • Not seeing a free Windows 10 license on Dreamspark yet.
  • Just upgrade your machine that already has a Dreamspark key in it...not rocket science.
  • Which product key do we have to insert? Will we get that with the iso file?
  • If you buy the new OS, you'll recieve a product key with the OS. If you have a genuine copy of Win7, 8 or 8.1, doing an upgrade doesn't require you to put in a product key. If you do a clean install, you'll need the product key that came with you device.
  • Wrong.  You have to perform the upgrade FIRST.
  • On my device was window 7 home and the product key label at the base ..now if I do a clean install to window 10 can I use the product key label on my device (laptop) to activate window 10
  • I'm using an 8.1 preinstalled laptop.. If I extract the product key will it work on Windows 10?
  • Nope, not likely. Didn't work for me.
  • All you need to do is run the 10 upgrade from Windows Update.  Stop trying to make it hard.
  • what about insider do I need to download and install the tools?
  • Can I mount the ISO on Windows 8.1 and use it to upgrade to Windows 10?
  • Yes.
  • Thanks :)
  • Can I use product key of old laptop having windows 7?
  • Yes
  • I think No.. if its a pre installed software from the computer manufacturer. I tried using my viao product key came along with laptop and i cant able to activate with it. So its better to upgrade..dont clean install with iso files
  • Try using windows activator?
  • Hey AJIKUR,