Running l2-fix worked. Can you change its name so it's l2? I presume you'd have to rename the other file as well.

I've done all this and while the game runs just fine and I can get to all the levels, I can't save at all. I've tried going to menu after a level and saving from there, but when I try to load a game I just start from the beginning again. I've also tried pressing F12, as some guides say that works, and that doesn't do anything either! What am I doing wrong?