The site originally said something along the lines of "First level: FREE," suggesting the other 4 would need to be paid for, which is extremely asinine. Now the site just lists non-game-related rewards for donating. Point being, they are keeping the setup whereas they have this butt lovingly extreme protection for the files. It has a special archive that is passworded, when the game loads it always re-unpacks the files to a temp location which even if you can find it can't normally be accessed via explorer because it does some trick that sends you back to My Computer. And even if you do get in, changes would have to be applied every time the game is turned on.
Point being: Why do they still use this ass forget file protection? They don't need it anymore.