No idea how to use this, following the instructions just throws errors

I'm trying to use this tool to fix this bug in the game: https://www.reddit.com/r/Doom/comments/1t8thxu/help_health_upgrade_bug/

But for the love of god, everything I've tried does not work. Not in terms of solving the bug, but to make the tool to start and run.

Any instructions(other than what is provided here, those do not work) are welcomed.

Thanks in advance.