Lo-Fi Games

What do I do if I bought the game 3, 4 months ago, I changed computer and I don't remember my key?

Send a pm to chris-the-great with the name you used to buy the key and maybe your email used, that way he can tell if you really bought the game and give you your key.

It helps to have some backup folder where you keep all your keys

It's the first time I experienced that kind of problem, hopefully, I can send that pm to Chris.
But yes, I bought tons of games, and the key is usually one time usage, and what I usually have to remember is my login/pwd.

Thanks for your answers btw.