Hi again!
Is there any chance you still have access to the old PC, or its hard drive? If so, you can copy the save files over to the new PC, and it should work as long as you include all of the files including the config and globals files.
I'm not familiar with any other mechanism to transfer save data on the standalone version.
(For reference, the Steam version is compatible with Steam Cloud for save files, but unfortunately I don't think that helps us in this case).
Thanks, and I hope this info is helpful!