umm just copied this from a website have you tried this ?
while playing press simultaneously Left CTRL & Left SHIFT release it & quickly hit Tilde ( ~ ), ( ' ) or ( ` ) key for the us keyboard & the small ( ² ) for Europe (anyway whatever the button's apearance & is name ( ~ , ' , ` or ² ) its always on the left of 1on your keyboard), then during this game just hit the tilde key ( ~ , ' , ` or ² ). Also, some will just need to hit the tilde ~ key.
It has been reported (Europe) that holding simultaneously the right Alt & 7 then release them & hit again the 7 will do the trick... Then enter any of these cheats codes. Also when editing your .ini file under EnableCheat=1 add this line EnableConsole=1, then hold simultaneously the right Alt & 7 then release them & hit again the 7 & pause the game & enter the wanted cheats.