Adventure Gamers - Forums
E.P.I.C. is still available from Alawar Games. I know some people have had problems with that site but it worked for me at the time.
FWIW: Regardless of the source I think you will have a hard time playing it on a Win10 machine. I installed it and there is a lot of video “chatter” going on, which makes the game unplayable. I did send the BFG diagnostic file to their customer support group. While they did say they would look into the problem, they also sent me a credit for a new game. Not putting words into their mouths, but I doubt they would have sent me a credit if they thought there was a solution.