I downloaded the C4 ExPansion pack a little while back and When I went to download it again it wasm't there. I downloaded the newest version of it, but when I went to join a friends server that the map was made using 1.5 it wouldn't let me. I kept getting an Ipoly error. I downloaded the 1.5 C4ExP file from him and it worked fine. Is this normal or do I have to have both versions? I am loading it on our public server and need to let the fellows know which version they need. I would appreciate any info I can get where I can add these maps into our public server.