I have reinstalled the FlightSimulator App from the microsoft store, but not the Official and Community folders, I can’t seem to select the previously installed folders, and it is forcing me to install all 90 gigabytes.
Topic moved into #bugs-and-issues:performance for installation problems.
Just point to the existing folder when it starts for the fist time and asks where to download the files to.
You may need to manually edit UserCfg.opt.
This answer tells you to delete the last line and let FS2020 ask you. Or you can edit the last line to point to the proper location.
That way you don’t have to keep pointing the updater at the correct location every time there is an update. The updater should be smart enough to find the program path on its own. Since it isn’t, you need to manually edit in where you have it.