I would recommend reaching out to Tapatalk for the best way of uninstalling. As it is their application, they are the best source. I can’t remember if it had an ACP component in version 3 so if it did, you’ll want to remove anything there too.
Right now, you are getting stuck on a database conversion to UTF8 so nothing in the folder is preventing this from working so I would not go that far yet. However, you only need the database to perform an upgrade. That will carry all your data.