I want to delete current library and setup new one
I think “Audirvana Library” refers to the metadata repository, not the music source folders.
On the Mac, it is ~/Library/”Application Support”/AudirvanaDatabase.sqlite. While Audirvana is running there’s also a journal file.
Not sure what happens if you just remove those files (or move them someplace else). I suppose Audirvana will build a new database on next start. You may also have to register the license or validate your account.

