Re-install problem

I want to re-install GSB on my pc but I can’t remember the details I originally used (it’s been more than a year since I used this PC and I had a different email at the time). The game was also installed on an external HDD where it worked fine until the HDD failed so I know I have the game (somewhere) since I have debug info for it in my documents/my games.

How do I find out these details needed to re-install since I probably need to re-download the installation files.

If you can remember who you bought it through and what email you use to have, could could contact them and update your details and get a new link to download the game. (it might also help to include some other details to show proof of purchase)

Done - thanks.