Every time I open up the client I get a firewall/server is offline message and I know my firewall isn't blocking it and the server isn't down because my friend is on. How do I fix this? Also many times I open the client but my computer deletes the client right after and won't even open the game
Make the client an exception under your antivirus, that's what's stopping you from getting on. To find out how to do this type "how to make an exception under <antivirus name>".