Builds of Windows 10–like the fall update, Windows 10’s first big update–aren’t like normal Windows updates or service packs at all.Instead, they’re more like upgrading to an entirely new version of Windows.Otherwise, assuming it’s been less than 30 days, your old program files will still be there for you to recover.
When you install a major Windows 10 update, you may reboot to find some of your programs missing.
Yes, Windows 10 may remove your programs without asking you–but you can get them back pretty easily.
(We’re really not sure about this, as Microsoft won’t explain how this works.) If you need the program’s files back, you can get them.
Windows 10 will keep your old Windows files for 30 days after an upgrade, storing them in the C:\folder.
However, Windows doesn’t provide any notice that it’s removed a program–the program will just appear to vanish from your system.