This is what I did.. Install clean Pandora Tomorrow.
Apply official 1.1 patch
Download (these are the names from Gam€*********, I do not know the names GCW uses)
SPLINTER CELL: PANDORA TOMORROW v1.0 [ENGLISH] FIXED EXE (1.31MB)
SPLINTER CELL: PANDORA TOMORROW v1.1 [ENGLISH] NO-CD/FIXED EXE (1.21MB)
Use the Splintercell2.exe file from the 1.0 nocd, and and all the files from the 1.1 nocd (remember to put the files in the correct folders!). That way both multiplayer & singleplay should start-up fine with no cd nags.
Works for me anyway.
Update: -
I think its:
http://dl.gamecopyworld.com/dl.cgi?dev-sptg!rar
http://dl.gamecopyworld.com/dl.cgi?dev-sptf!rar
Which are the equivilent downloads from GCW.