I just tried to install an update to MuseScore 3. It failed, but deleted my previous version so now I can't use MuseScore.
Windows 10 gave a message during installation warning that an attempt to write to a restricted folder was blocked by Windows. The installation later aborted with a message about being unable to do something with a temporary file that was needed for the installation.
I then tried to uninstall MuseScore so I could start a complete new installation. But the system seemed to think that MuseScore is no longer on my computer. So I went to the MuseScore.org website and downloaded Musescore 3 and tried installing it. Same behavior as before: Windows blocked access to a protected folder and the installation failed.