Windows 10 build 14915 (Redstone 2)
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Windows 10 Redstone 2 (build 14915) for PC and Mobile ready for download

Microsoft delivers new Windows 10 Redstone update (build 14915) for PC and Mobile with new improvements, fixes, and various known issues.

Microsoft is now releasing Windows 10 build 14915, part of the Redstone 2 update scheduled to roll out in early 2017. The new update is available for PC and Mobile devices enrolled in the Fast ring of updates.

The new Redstone 2 update still doesn’t bring new big features, but it allows devices with Delivery Optimization enabled to download test versions of the operating system even faster. In addition, Windows 10 build 14915 also fixes a lot of issues and adds new improvements.

Delivery Optimization for Windows Insider Preview builds

Delivery Optimization was first introduced on the Windows 10 November Update, and it gives users the ability to turn on a toggle switch to speed up the download of updates. The feature works by using computers in a local network and other PCs on the internet to download parts of an update, rather than downloading everything from the Microsoft servers.

However, the Deliver Optimization feature only worked with production releases of the operating system, now starting with build 14915, users with this feature enabled can also download new Insider Preview builds.

Delivery Optimization is enabled by default, but you can disable or double-check if it’s turned on by going to Settings > Update & security > Windows Update > Advanced options and select “Choose how update are delivered”.

What’s new on Windows 10 build 14915 for PC

On build 14915, Microsoft is fixing and improving the following:

  • Fixed power button issue on the Start button.
  • Fixed issues with certain apps crashing.
  • Fixed Mail app toast notifications.
  • Fixed problem with the Run command.
  • Fixed issue with Chinese Input Method Editor.
  • Cortana’s text to speech capabilities should now work.
  • Settings app should no longer crash while navigating different settings.
  • Improved language translations inside the operating system.
  • Changing the Windows Insider Program settings should work again.
  • Connect flyout has been updated to offer a better clickable area.
  • Addressed issue with copy and pasting text from Microsoft Edge.
  • Microsoft Edge improves favorite importing from Internet Explorer.

Known issues for Windows 10 build 14915

  • Adobe Acrobat Reader crashes when you launch it.
  • Black screen may appear signing out and switching to another user.
  • Bash on Ubuntu on Windows 10 doesn’t work in this build.
  • Settings app may crash accessing the Personalization page.

What’s new on Windows 10 Mobile build 14915

  • Fixed issue when moving apps to an SD card or internet storage.
  • Fixed issues with certain apps crashing.
  • Fixed issue on Microsoft Edge advanced settings to improve the download experience.
  • Cortana’s text to speech capabilities should now work.
  • Changing the Windows Insider Program settings should work again.
  • Improved language translations inside the operating system.
  • Improved “You need to fix your MSA” toast notification, so it’ll no longer notify you multiple times in quick succession.
  • Improved Continuum for better connectivity with Windows 10 devices.
  • Improved sound settings so that audio files will automatically show as available when trying to change ringtones, alarms, and notifications.

Windows 10 Mobile doesn’t have any known issues.

Microsoft has published the complete list of fixes and known issue for build 14915 at the Windows Blog.

Windows 10 build 14915 for PC and Mobile is available immediately through the Fast ring. The new preview will download and install automatically, but you can always force the update from Settings > Update & security > Windows Update and clicking the Check for updates button.