Windows 10 preview build 10525 now available for Windows Insiders in the Fast ring

Microsoft has released a preview version of Windows 10, with the build number 10525, to members of the Windows Insider Program. It's the first such build to be released for members of the Windows Insider program since Windows 10 officially launched.

In a blog post, Microsoft's Windows Insider head Gabriel Aul stated:

"Feedback from Windows Insiders not only helps us build Windows 10 – it also helps us shape how we run the program. For example, Windows Insiders have asked us to improve the flighting cadence and to keep the Windows Feedback app in the product – which we have done. We're also evaluating the Windows Insider rings, and considering whether we should make changes there. Over the past few months we've been looking at feedback to see what changes we want to make going forward. We're putting plans together now, so you won't see any changes immediately, but they will come over time. We'll be doing our best to make sure that we improve every aspect of the program, from build distribution to the Feedback app and Insider Hub. And of course we'll be looking to do more fun things for Windows Insiders as well, like our Insiders to Campus event, Ninja Cat goodies, special wallpapers and more."

Here's what's new in the Windows 10 preview build 10525 {.cta}

Here are the known issues in the Windows 10 preview build 10525 {.cta}

Source: Microsoft {.cta}

  • Anything new?
  • Tile color, and a new branch (TH2), Pre release of Windows 10 update wave 2 (October).
  • What is the download size???
    If I get any problem with the preview version, what to do? Will I have to do a clean install or just turning off the insider preview will help returning back to previous windows 10??
  • Can we upgrade our Windows 10 to this?
  • I suppose not if you have a regular copy of windows 10 then maybe you need to enable dev prev access again.
  • I enabled it and restarted but no update showing. Do i have to wait?
  • I think so
  • just downloaded it now
  • There is a fast ring setting in the update section. Wouldn't that enable this update?
  • If you are a Windows Insider and if you did not "stopped" downloading of future preview builds.
  • I'll be trying it when I get back home tomorrow. Maybe there will be a change log by then.
  • Wow, that was unexpected. I want to see the changes before updating though. I have my main Pc set up pretty nicely after RTM came out.
  • Can i still register as insider and install the preview?
  • Yes I think. If you did a clean install to a regular win 10 then you need to get dev preview acess again thru insider.
  • Yes, you just have to enable Insider Preview updates through Settings app > Update & Security > Windows Update > Advanced Options > Get Insider Builds.
  • Thank you
  • I hope they fix tablet mode. It is such a mess compared to Win 8.1 on Tablets.
  • totally - I like win10 otherwise but that part is probably the weakest point - e.g. the task-switching (touch or keyboard - especially if running a hybrid), it's painful, near unusable (more Android feel and lag : )
  • Can you elaborate? I don't see it as painful at all. I can task switch by using the taskbar, if you enable to view the icons, or I can swipe from the left to get the card view of the open apps. What's so unusable about this?
  • Installing it now.
  • Let us know how it is - pjrudd
  • Here are the changes  Updated color options! We got a lot of feedback on the default color for Start, Acton Center, Taskbar, and Title bars and that you wanted to be able to change to reflect your preferences. This feature is now available (though still early) in build 10525 for you to try. This is off by default, but you can turn it on by toggling this (Settings > Personalization > Colors):
    Memory Manager Improvements: In Windows 10, we have added a new concept in the Memory Manager called a compression store, which is an in-memory collection of compressed pages. This means that when Memory Manager feels memory pressure, it will compress unused pages instead of writing them to disk. This reduces the amount of memory used per process, allowing Windows 10 to maintain more applications in physical memory at a time. This also helps provide better responsiveness across Windows 10. The compression store lives in the System process’s working set. Since the system process holds the store in memory, its working set grows larger exactly when memory is being made available for other processes. This is visible in Task Manager and the reason the System process appears to be consuming more memory than previous releases. We do have a few known issues with this build. Part of the fun of being a Windows Insider is getting to tinker with prerelease software before the rest of the world, but you should be very aware as an Insider that prerelease software will come with bugs and things that are incomplete. Make sure you know and accept what you’re opting in to when you join the program, and of course make sure to back up all of your personal data before you begin. Mobile hotspot doesn’t work in this build. When sharing the Internet from your device with mobile broadband using Mobile Hotspot, it will fail to get a valid IP address from your device and will show no internet access. An update to Movies & TV application from the Store will be required to fix an issue with video playback. Optional languages packs will not be available during the initial launch of this flight, it will be available later this week.
  • Thanks for the feedback
  • The compression store concept sounds promising.
  • That last paragraph is identical to the issues that were posted for the windows phone build that was released recently. Are you sure your post is related to windows 10 and not windows phone 10?
  • Never mind. I click on the link and saw that these are the issues with this build. Funny how they are having the same issues with both wp and windows 10. I guess the two really are converging.
  • Well they are both now the same TH2 branch
  • Oh how i wish these builds were released in same moment each time for PC and phone :'(
  • I am installing it now on my desktop! B-)
  • ok, i get that theres a way to break internet sharing in mobile/phones, but how did they break it in windows 10 for desktop? does this apply to only to devices with a wireless LTE modem like the new surface 3 LTE or the hp Stream 8? or is basically every device that they've broke the ability to access a mobile hot spot?
  • No. You can have a desktop or even a laptop with 2 NICs, 2 WiFi dongles/cards or one of each. You can be connected to the Internet using one of the connections and share it using the other.   But not in this build. :P
  • I've jumped out of the Insider Program. Once I see the sort of builds (feature-wise) Microsoft is releasing, I'll evaluate if I want to join in again or if it's not worth to bother with.
  • Will it download just the update part or the whole 3-4 GB OS??
  • What do you think. Microsoft, like Apple, assume everyone has unlimited reliable fast internet.
  • Sucks for people with living with caps but with any luck it will eventually force carriers to modernize their policies. Apple is pretty much responsible for forcing carriers to provide mobile bandwidth people actually wanted to use.
  • Well somehow this update managed to mess up with keys and now the os is not activated how do I solve this issue? :)
  • Insider to Campus? wen in Indonesia?
  • Was hoping for another mobile build... :(
  • I've tried twice to install build 10525 but each time it hangs at 96% overall (85% Settings).  Restarting manually luckily allows me to revert back to the RTM build of Windows 10 with no issues. I've been on the Insider program for several months and ths is the first time I've ever had a problem.  
  • Why I didn't receive windows 10 for Lumia 525 in srilanka
  • Wao!! I'm signed in for the first time to comment! Texas! The 'ok' bug went! Kewl love it!!!! I love windows 10 Posted via the Windows Central App for Nexus
  • The upgrade appears to have severely damaged Chrome. I was using Chrome before I updated and now, after the update to 10525, Chrome crashes immediately on startup (He's dead Jim). I have tried disabling the extensions but it made no difference. I uninstalled Chrome and the reinstalled. Same problem. Life as a beta tester I guess.  
  • It appears there are two workarounds for this. It only affects the 64 bit version of Chrome so uninstall the 64 bit version and install the 32 bit one OR launch the 64 bit version with the --no-sandbox flag.
  • See if you have anything in your event log.  Chrome loads ok for me. 
  • I'm on fast ring and still not seeing the update after a restart.  Ah well.
  • Is the 10525 preview build for mobile phone and/or pcs?
  • I installed this copy now there is watermark on desktop 'windows 10 pro insider preview evluation copy build 10525.'   did it deactivate my windows 10 license?  will this copy expire? 
  • ?!? Wanted to update my insider install today again after I'd left it untouched for a month. But after applying all the backlogged updates I still don't see this build. Yes, still in fast ring.
    Any ideas what's wrong. Is it withdrawn? Not published in all languages? Any clues!?!
  • Leave it. It's downloading now. No idea why it did not show up yesterday.