Steps:
1) Go round someone's house, or use a net-cafe that's nice and doesn't get pissed off if you install stuff - specifically GPS2, the PDUID grabbing software from Darkfader.
2) Download and unzip aforementioned program, namely GPS2.
3) Open up mIRC, connect to efnet, go to #gp32
4) (I think) Type "!encrypt" and it should give you some instructions. "!applist" or "!list" will hopefully list the apps you can possibly encrypt.
5) Encrypt either Freelauncher or Windups, or anything else on the list that opens .fxes.
6) Copy over using an SMC reader, if available, or install PC-Link and cross your fingers on the PC you're on.
7) (Optional) Flash firmware so you don't need to worry about going through this palava again, and can just open up GPDrive and use that...
The key steps, of course, are (1) and (6); you need to find someone who's willing to let you piss about with their machine a bit in the first place.