@AnneSims34 Yes, please move over one or two of your old saves and let me know whether they have the same problem as before. If they do, stop there and let me know. Otherwise, you can add your other saves and test, then add anything else you want to keep as well. Please move files in batches, testing each time so you know if and when you reintroduce an issue.
Wherever the game has regenerated a file or folder, leave that in place, and only move over the content that doesn't get recreated. For example, keep the new options.ini, and keep the new saves and Tray folders, only transferring the files inside these folders.