As the Creators Update starts showing up in the corners, Microsoft is trying to make sure it remains bug free. For further testing and polishing, build 15063 is rolling out to Slow Ring insiders on PC today. This is the same build which rolled out to Fast Ring Insiders earlier this week.
This build keeps on with the trend of all current builds, no new features but a slew of bug fixes. Mainly, the crashing bugs of Microsoft Edge has been ironed out and the Store should work as before. Language packs should be also working fine now.
As for known issues, nothing major is there. If you however get stuck on installing the update, a restart should fix it. The full change-log is available here for you too read all the details.
You can download the update by heading to settings and checking for updates. The update is not available for Mobile users on slow ring though, but we expect a slow ring build for mobile soon.