Microsoft accidently pushes 9932 build for Windows 10 Preview but fails to install

If you are using the Windows 10 Technical Preview, you may have had a few updates tonight. One of them is a Flash security fix to build 9926, and another is for the Windows 10 Technical Preview (KB3035129).

Interestingly, some users are also getting notifications for a 9931 and 9932 OS update. While at first this seems like good news as it implies new features and fixes, truth be told the update is meant for internal Microsoft testing only but it had been accidentally exposed. As a result, those attempting to install the update are met with a failure to install due to not having the proper credentials.

Microsoft's Gabriel Aul took to Twitter to explain the issue to users experiencing the installation failure:

"Yep, looks like this is on us - we're exposing some build offers that we shouldn't - sorry, only MSFT can get…Yup, you're right. the KB exposed this. Don't change your branch or you could fall off accidentally and not get next flight."

As of 11 pm ET, it appears that Microsoft has plugged the hole as our machine is not experiencing any problems.

For those curious, Update for Technical Preview KB3035129 reportedly patches "some key things - like Xbox Live games sign in", so make sure you do install that one. Here is the full changelog for that update:


  • Reliability improvements for virtual machine live migrations
  • Reliability improvements to prevent some system crashes in SettingsSyncHost.exe
  • Reliability improvements to prevent possible data corruption
  • Increased power efficiency to extend battery life
  • A fix for an issue that prevents the new Store (Beta) from appearing on the taskbar
  • A fix for an issue that could cause users to remain at the "Please Wait" screen when attempting to sign in with a Smart Card connected
  • A fix for an issue that could cause virtual machines (VMs) to lose connectivity to virtual hard drives (VHDs)
  • A fix for an issue that could cause error 0x8E5E05E2 when installing apps
  • A fix for an issue that could cause a delay when opening a new tab in Internet Explorer
  • A fix for an issue that could cause the system to fail to resume from sleep when connected to multiple monitors with some graphics drivers
  • A fix for an issue that could cause the Start Menu to be improperly registered and fail to launch
  • A fix for an issue that prevents launching XBOX Live enabled games that require sign-in, and would incorrectly result in the message, "To use this app, you need to sign in with the Microsoft account that was used to download it."
  • A fix for an issue that could present the user with the incorrect End-User License Agreement (EULA) during upgrade

For now, users should remain on build 9926. The good news is further updates, including bringing back Start menu resizing, should be on the horizon soon.

Thanks, everyone, for the tips

Daniel Rubino

Daniel Rubino is the Editor-in-chief of Windows Central. He is also the head reviewer, podcast co-host, and analyst. He has been covering Microsoft since 2007, when this site was called WMExperts (and later Windows Phone Central). His interests include Windows, laptops, next-gen computing, and watches. He has been reviewing laptops since 2015 and is particularly fond of 2-in-1 convertibles, ARM processors, new form factors, and thin-and-light PCs. Before all this tech stuff, he worked on a Ph.D. in linguistics, watched people sleep (for medical purposes!), and ran the projectors at movie theaters because it was fun.