I generally don't support cracking games, but go ahead with this. There are so many game breaking bugs 2 years after release that you can't guarantee you'll be able to finish the game you've paid for. I don't feel like playing those 6 hours again just to risk losing everything again, so it's going on the trash pile. Shame, I was enjoying it before that.
I was enjoying this for the first 6 hours, then decided to revisit the Gunbarrel sewers to look for storage containers. End of the game for me! Once you've entered, you can't get out, at all. You can't get back up once you've jumped down, and the lift at the end of the sewers only works once. After that you're stuck down there forever. It was suggested that you might be able to noclip out with CheatEngine, but that doesn't work anymore either. The only 3 auto-saves are all after entering the sewers. So I can't recommend buying the game unless you want to risk having to literally start again hours later in a AAA game.