I am trying to execute exactly what this article says and I meet all requirements. I have a Mac with SQL Lite 3. However, when I execute the first command, instead of getting settings.sql, I am getting com.plexapp.plugins.library.db-shm and com.plexapp.plugins.library.db-wal.
Those instructions need to be updated. Plex made changes to the database that prevents the standard sqlite3 program from being able to modify a database. Plex has provided it’s own SQL command tool “Plex SQLite” in the executable folder. Use that instead.