Aliens vs Predator 2 & Primal Hunt copy

a crack for avp2 cracks the exe (obviously), and the exe filename is avp2.exe (i think), anyway to crack the game you obviously copy the cracked file over after installation. Now on the cd the autorun file is also the avp2.exe file which is the file that gets installed too. So if i don't replace the autorun file, then when i put the cd in the launcher file (avp2.exe) file tells me that the cd is not an original, so i thought 'ok, i'll just replace the file with the cracked file', i did this and the autorun launcher comes up and works, but when i go to install it, it says 'crc error: avp2.exe file in install directory is not the same size as in the cab files', i checked in the cab files and that file is not there. Anyway i can click 'Ignore' and it'll still install, but now it'll install the cracked avp2.exe, (the file i replaced as the autorun file). I want to be able to have the autorun come up without telling me that i've got a burnt copy in, (which i can do) but i also DON'T want it to automatically install the crack. I know thiis is an odd request, but is it possible?, this problem also applies to the expansion, except the problem is with the PrimalHunt.exe file

how exactly do i do that with a hexeditor?

don't worry i've done it, thanks!