Just for anyone else doing this, I noticed a trap in the new install which I always miss: Turn off Thumbs in Folder Options. What I did was first make sure that all files were visible (Show Hidden Files) and then turn off the thumbs checkbox.
I transferred the folder with all (content and torrent files)
and over wrote the folder. I haven't checked all transfers but the whole group seems to be in there. Over time there are some duplicates and dead wood to edit.
I have not done the appdata procedure given yet.