When its downloaded click on the .exe file... It will install then go to your half life directory and start half life, that is assuming you do have it, if you do not that is your problem.. Ok so when Half life has started up click on Custom game and select ESF. Then to get the servers you want you go to internet games then filter make sure you select esf as the game and hit update.. Then click on a server that you ping decent on and your good to play!