I think what he meant is that Just2Clean customization packages don't work.
I did as you suggested by deleting the .rgu and .dsm starting with Z, but that still didn't work.
The option XML file needed to be edited because it pointed to those Z files not the A files.
Not sure if just deleting the .dsm and .rgu starting with A would've worked because I didn't try that.
After deleting the UPXed packages everything works for me now.
Deleting the Z and renaming them to A is fine.