Microsoft released Windows 10 Mobile build 14371 to Fast Ring members a few hours ago and has now announced the exact same build for PCs. 
Windows 10 build 14371 for PC brings only one new feature regarding activation.
Microsoft says it has received many complaints from users who were unable to activate Windows after changing hardware, such as hard drives or motherboards.
With this build, Microsoft is bringing a new activation troubleshooter that you can find under Settings – Update & Security – Activation – Troubleshooting.
The new feature will show you the necessary steps to successfully turn on your computer.
Additionally, with this build the company is also introducing a new option that allows you to link your Microsoft accounts to the digital activation license.
The new Fast Ring build brings a lot of bug fixes and performance improvements, which makes sense considering we're about a month away from the official release of the Windows 10 Anniversary Update.
