@Dracula` maybe he can helps u.
There are patches for mod loading that remove this restriction, fairplay the anticheat had it aswell. This is dinks mod a clientside mod widely used in 2012 by everyone. Looking inside the mod, I see a cgame file present, it means there is working code for demo/v1.02t cgame pk3 compilation, assuming someone made some changes in the existing v1.00 SDK to make it work with demo, im looking for that. I tried compiling with v1.03 sdk aswell but I get version mismatch.