I hate to be that guy on piracy community but if you wait till June 29 the game's probably gonna get 90% discount on Steam Summer Sale, that is like $1 in most regions

Portal 2 is really cheap when on sale these days, so it's probably not worth the hassle.

If you really want to though, you can get a somewhat recent cracked build of Portal 2 (one with split screen support, which was added years ago iirc), and then use Remote Play Together (ironically a Steam feature, just search the internet on how it works with non Steam games).

Or you can both have it cracked, and then play via ZeroTier or Hamachi (or whatever folks use these days) and use the in-game console to connect to your buddy (or vice-versa), search for "Portal 2 coop lan" or whatever.

Dude portal 2 costs fuck all, I know this community is about piracy, but come on man...

The solution is to use a multiplayer friendly emulator like goldberg... simply copy the files to the second computer. Start a co-op game and use the connect command in the console. You will need to open console by going into settings, keyboard settings and enable console(I'm writing this from memory so something could be wrong). Press the tilde key and type...

connect 192.168.1.12

(Change ip to your computer's ip, use zerotier if you're not on lan)

To add to the other comments, I don't want to shame you if you are unable to buy 2 copies, but below is a link to the SteamDB page if you want to see how cheap it becomes in your region, it's usually extremely cheap and would solve all your problems.

SteamDB link

Just a gentle reminder of rule 3, "Don’t request or link to specific pirated titles". I think this thread qualifies as general advice rather than a request for download links, so I think you're ok.

I'm really disappointed in all those people pitching to buy the game. In a piracy sub. iN a PiRaCy SuB 👁👄👁