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First thing I reccomend is to FIND where valid Librares exist on you PC.
Using the OS serch: look for metadata.db . That is what Calibre shows you and uses to get books from the Authors folders in the same place.
(the reason you don't rename anything HERE using the OS)
If you find more than 1 DB, then look and see which containing folder ALSO has lots of Author folders.
That is the folder to use when you right clic the Library icon: Switch/Create: Use Existing: <the path you found>
No metadata.db. Try running the restore database tool. Right-click the Library Icon: Library Maintenance: Restore (This can take hours for large libraries, but way faster than just adding book PLUS it will have updated metadata)
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