Well, things are working better than originally thought. The forms migrated from 4.2 to 5.0 and when do the relink to the new paths for about 1000 at a time, it works.
Now is the interesting part - the migration utility migrated PDF Log entries for forms, but not registers. And when you try to run it again for journals, it says that you can only migrate version 4.30 or higher. New to me.
I'll let you know if we come up with any solutions