I am also dealing with this same issue. Although this is my first time using any toontrack products so there would be no reason for me to have an “old” version of Product Manager yet when i open it immediately downloads the update but cannot use because like Cmckillican had it said it couldn’t remove the old version. Please help!
Mac (21.5 inch Late 2013)
3.1 GHz Intel Core i7
macOS High Sierra 10.13.1