So, how can I play this?

[MHT. Agua]

I remember we bought a 4 pack key when the game was out, but me and my friend have been checking the emails and didn't found the keys. And we don't have the game on steam either.
I remember we left the game unplayed because on release there where horrible pathing issues, but we later heard they where fixed. Anyway, if there is any way to play the game, please let me know, it doesn't let me buy it on steam or in the webpage.

[Danny]

If you bought on steam, you could check your steam inventory. If you bought it from the website you're probably out of luck because it is defunct and the developers don't really support it anymore. Multiplayer is functional through a mod, because the official servers don't really work anymore, and while there is a small discord community, it is for the most part inactive, although people will respond if questions are asked but I can't tell you the last time anyone actually played mp. That's about it really.