I've followed the instructions on the CivFanatics post I've tried both on the original version and the post-Steamworks version to get the mod to work to no avail. Can anyone confirm if the GOG version is able to run the mod without any issue? (before I buy it here and end up disappointed and cry in my bed)

Nevermind. Managed to fix it. It appears that even when BugMod is uninstalled, it makes some changes on the launcher that persist even when uninstalling the game. I deleted the Civ 4 folder in My Games, under my user's folder, and it managed to run!

i try to run the fall from heaven mod , but it doesnt run , try it again but it will not lauch , heul !
fall from heaven is the very best mod for Civ 4 , Can anybody help me ?

Short search implies that it should work with the GOG version:

https://forums.civfanatics.com/threads/version-2-7-release.612068/page-2#post-14796579

If you cant get it to work you are probably better off asking there instead of here:

https://forums.civfanatics.com/forums/civ4-fall-from-heaven.190/
or
https://forums.civfanatics.com/forums/more-naval-ai-modmod.476/