How do I install Halo WITHOUT the CD?

[Amit]

Who's EX?

But yeah, if the game requires a keycode to install, an iso is perfectly fine. I know a few games that have online downloads of their installer.

Hope you don't get disappointed by the halo pc comm like I was. it's really empty or the servers were only playing hugeass or extinction.

Hit up Freelancer's server, you'll have bucket loads of fun.