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Windows 10 build 16299.15 rolls out to Slow ring Insiders

We're rapidly approaching the October 17 launch of the Windows 10 Fall Creators Update, and Microsoft is starting to wrap up testing with Insiders. In its latest move, Microsoft has started rolling out Windows 10 preview build 16299.15 to Insiders on the Slow ring.

Build 16299.15 first hit the Fast ring on October 2, and it doesn't contain any new features or notable fixes to speak of. What it does represent, however, is the Fall Creators Update's move to Release To Manufacturing (RTM) status, which marks 16299 as the build Microsoft will service with cumulative updates going forward.

Upon its release to the Fast ring, Microsoft indicated it would begin servicing this build with Cumulative Updates via Windows Update. We'd also expect that build 16299 will make its way to the Release Preview ring in one form or another ahead of the Fall Creators Update's release on October 17.

Dan Thorp-Lancaster is the Editor in Chief for Windows Central. He began working with Windows Central as a news writer in 2014 and is obsessed with tech of all sorts. You can follow Dan on Twitter @DthorpL and Instagram @heyitsdtl. Got a hot tip? Send it to

  • ISO! ISO!
  • njhbnbb
  • Can find a 3 party one at thewincentral for 16299.15
  • From Yeah let's all install Windows using a source file from a Russian server....
  • Well, I've never had a problem. It was just a suggestion.
  • I'd never trust any software from 3rd-party services, Russian servers are just asking form trouble. Official ISOs will be available soon, I'll wait
  • you can get via media creation tool now
  • These constant updates every few weeks is becoming redicules. And that's not even on fast ring. Don't mind security updates but system updates don't seem to change anything except suck up my data.
  • That is typically the case around release on the Insider program. These system updates kill the last minute bugs. From now on, it'll be better because it'll only be cumulative patches, not whole builds. So you'll now still have "constant updates" but they won't suck up your data as much because they're regular cumulative updates. I'm guessing though, that they'll do only one major cumulative update before Oct 17.
  • You can rest easy then knowing this is RTM and from now on we'll only get small, up to 100 MB or so cumulative updates.
  • Feel free to opt out of the Insider Program.
  • Than you really should be on production build
  • I feel the same. Not to mention cutting into productivity, while it's installing and rebooting 10 times. I've opted out of Preview releases.
  • People who run insider builds on production machines can't complain when they have downtime.
  • Then just quit the insiders program...
  • What's happening with the Mobile? What Dona says about it, between fashion and cats tweets?
  • You're still expecting mobile builds? Poor lamb.....
  • They've been really slow with the Mobile builds lately. 15254 was out 3-4 days ago. So hopefully within 3 days, they will release it.
  • I just installed it and I noticed that "Files On Demand" is missing from OneDrive. Any advice?
  • Still have it. Go to setting and see if it's unchecked.
  • There is no option in the OneDrive setting to Enable/Disable.
  • A few builds ago it disappeared on a couple of my computers so I just did a recovery to clean install and it came back. Fortunately those weren't mission critical machines.
  • Had to reset Skype and also OneDrive did not work correctly after the upgrade.....
  • Since it's RTM, You should wait for the ISOs from MSDN.
  • Why they didn't tried another build, so the number could be 16300
  • I've been on slow ring for Fall creators update and this RTM build is by far the buggiest yet ! How's that possible when all the other builds were fine. No wonder people bash MSFT  
  • This build seems to be very much stable except for the fact the I no longer have on demand for OneDrive. I checked settings and on demand is gone.
  • I'm having major issues with this build starting with Cortana not seeing the microphone in my USB webcam which it did on the previous build and that Cortana will pop up OVER the start menu.
  • It is NOT ready for Dell XPS13 9343 (2nd boot jammed), Dell Venue 8 Pro 5855 (no Wifi), GA-X99-UD4P (Intel HD-Audio Device can't be started, Error "10")