That's the same as the one I installed on the child's computer.
If C:\Program Files\RegSupreme Pro\Settings\Directories.dat looks like this:
Backups=C:\Program Files\RegSupreme Pro\Backups\
Cache=C:\Program Files\RegSupreme Pro\Cache\
Tasks=C:\Program Files\RegSupreme Pro\Tasks\
Snapshot=C:\Program Files\RegSupreme Pro\Snapshots\
… and the RegSupreme Pro folder looks like this:
… Note: I deleted the two uninstall files since I never use them.
… then the previously posted changes to C:\Program Files\RegSupreme Pro\Settings\Interface.dat should work.
Here's the main window with Name=Tahoma and Size=12: