Problem: Trying to reinstall WSUS on a 2008 R2 server that crashed in an existing domain and keep getting the error:
Installation failed… Update could not be found
I figured the problem had to do with Group Policy specifying the old server as the domain wide WSUS and couldn’t get the update from it because it wasn’t there anymore.
Solution: *note. backup the registry before applying this fix.* Within regedit, go to HKLM\SoftwarePolicies\MicrosoftWindows\WindowsUpdate and delete the windows update folder and then restart the windows update service and installed WSUS. After the installation was finished, I did a gpupdate /force command and the deleted registry entry came back. *make sure you change Group Policy to reflect the new WSUS server.