You download the gro and place it in the game folder. If other files are interfering, then you can manually open it with winrar or zip and replace the knife's model. Or put it in a separate folder, if you don't wanna replace the knife.
okey wait i open it . man THANKS for the information , idk that i can open the gro files by Winrar , i always use a program call Dragon UnPacker , Thanks !
