Hey BLINXERIZER, so sorry you had that experience.
Basically, although I say you can use Version 5 and likely get some of the same things to work, Version 5 was unfinished and is missing multiple features that Version 4 has. So for my guide to be the most reliable to you, Version 4 is what you should be using.
That said, I also can't guarantee that every operating system will allow the software to function correctly. So far, it runs fine on my WIndows 10 computer, but that may not be true for everyone. And unfortunately, I don't think anyone truly knows how RGM was built, so trouble-shooting its issues on a hardware and OS level may be impossible for the time being.
Results will vary.