Here's a youtube video I made to help from classic hellfire 1.00 to 1.01 multiplayer and 1.02 RC 07, my antivirus messed up a few times and had to kill the hellfire task a few time but it's the written guide in video, follow the steps in the text guide and if you have some trouble understanding or other problems the video shows you how to do it. SInce Gog has already 1.01 you don't need the manual patch, and if you want to go straight to 1.02 RC07 you don't need the hacked hellfrui.dll part as well, but keep the 3 commands only in the command.txt file.

https://www.youtube.com/watch?v=oMKOd9irXYI