If opening the menu results in a crash, that's typically due to an issue with the EasyHook that 7th Heaven uses to insert executable changes for some users (it's a security issue). A couple other users ran into it in the past. I'd recommend visiting the Qhimm Discord and trying to get support for that there, as there were a few steps to take to try and get EasyHook working on some machines.
Alternatively, if nothing works out for getting EasyHook to work, I can provide a hextless IRO that has no .exe changes. Won't fix the underlying issue, but it'll at least make it playable.