mIRC

Instead of installing mIRC you could also use the web version, which doesn't require an installation: http://webchat.quakenet.org/

mirc 6.34
overinstall by nnscript
install mirc 6.35

use keygen on mirc.exe (run NNScript -> help, register use the shit keygen generated, voilá!)

i downloaded this cuz web version somehow wont work for me :/

I say the thing everyone are thinking about, I'f ur smart enough to play the game which is kinda dead u should be smart enough to read the lines and / between the lines of the match choises, so well.... welcome...?

someone should setup a slack account for crossfire (not sure if it will max out though).

https://slack.com

Use HexChat instead: https://hexchat.github.io/

Use IRCCloud instead http://www.irccloud.com

Use Irssi instead http://www.irssi.org/