We had a member at the QBasic Forum a couple of years ago, TheRealMikeHawk, who mixed a lot of DOS programing and asm routines in his QBasic games. Fell had a look at them, but determined there was no way to convert them to QB64, either then or now. Michael Calkins was another member with many DOS and asm skills. He joined here, but hasn't been around for a year or two. As for me, I only used a small bit of asm knowledge for mouse routines, etc. and never used DOS to make a program.
I don't have the more extensive background in asm and DOS as the two folks I mentioned, and since I have no interest in games, I would not be comfortable with working on an installer that requires a knowledge of the game. I absolutely pass on offering help on this one.
Pete