Hello! I found a way how to fix, you just have to download official RGM.
You included wrong one in the guide.
I'm actually not aware of there being a more "Official" release of the software. Version 4 and 5 have been uploaded to a few places.
Can you tell me where you found the copy that works for you?
moddb, 4th edition versions
Isn't that what my Guide links to? The link I provide on Page 6 goes to ModDB, Version 4.62.
I don't know, jut they didn't send me to moddb lol