You wouldn't want to tack this onto the Bug mod as it comes with bug already. You DO need to upgrade your civ bts version to v3.19 before installing caveman2cosmos in the bts mods folder.
So is it a problem that I have the BUG mod installed in vanilla bts?
Look in the thread called "Caveman 2 Cosmos", post 6, question 1. Check the link there, and that *should* help you fix your problem.
One other thing to check though. In your MODS folder, if the folder for "Caveman2Cosmos" contains only one folder also called "Caveman2Cosmos" in which is the mod, then that is your problem. There should be only one step, not two.
It sounds like you may have a shell folder which the mod is fully within. If you enter the Caveman2Cosmos folder from the Beyond the Sword->Mods folder, you see another Caveman2Cosmos folder inside that one and no other files, right? You then need to take that first layer out.
If the above is true:
1) Rename the initial Caveman2Cosmos folder (to anything).
2) go into that folder and cut the Caveman2Cosmos folder in there.
3) go back to the Mods folder and Past the Cut folder there.
4) Delete the renamed folder.
Then you should be fine.
I already checked that, so it appears that I don't have a shell folder.
But after looking through the files, it appears that all the C2C files are empty.. Any reason why that's a problem?
That would sound like whatever you used to extract the archive didn't work, creating only the filenames but not extracting any of the actual data. Did you use 7zip?
I changed to 7-zip, and it worked, although I only got parts if the mod. The new title screen were missing, but the title music were still playing. Anyone got an idea what this could be?
You did get rid of the old version before trying to install a new version - just checking.