Spetsnaz Posted February 21, 2014 Report Share Posted February 21, 2014 Hello, So me and a friend have been trying to play this online. I have 911: First Responders and he has Emergency 4 English. We tried several times but could not get it to work. We are able to connect but it states Checksum: files differ. Or something similar. We both have done complete reinstalls of our games and it still says the same exact thing. Can someone help us out here? Quote Link to comment Share on other sites More sharing options...
