Win 11 Server Version 1.40.3.8555 Update problems

Don’t use this. It is the skeleton of the database for a completely new installation.

This could be the folder where you can find all the databases.
To verify, open the windows registry and look for the string that is mentioned in this post: [HowTo] An extended guide on how to move the Plex data folder on Windows
If it has the content of E:\Plex files - Move, then it is the location that is currently used as your Plex data folder.

However, if you cannot find the string LocalAppDataPath at all, then you should look for the Plex data folder in its default location.
If it’s pointing elsewhere, then your data should be in this location instead.
Keep in mind that while doing this, you should be logged in to the Windows user account under which you are also running Plex server. (Just in case that your scheduled task for starting Plex is running it under a different account)

If the folder E:\Plex files - Move is indeed the one that is used as your current Plex data folder, it should have both
com.plexapp.plugins.library.db and com.plexapp.plugins.library.blobs.db
and a few backups of each (with added date in the file names).
If one or both of these files have an ancient file date, it means that they are either damaged or set as “read only”. Either way is bad.