There really isn't a need to make a different version just to fix this trivial issue.
If you can go into your explorer, find Cosmoteer (it should be in your "My Games" folder), then go to this mod (BloodCult), you should eventually find a file called "mod.txt" Open that.
Once it is open, you need to replace every instance of where it says modes/singleplayer/bounty
with just modes/bounty
. Basically, you don't need that "Singleplayer" bit in the file anymore. It may be hard to find with all those layers of confusing code, but a good shortcut to use is Ctrl + F, which is a finding tool. Just type in what you want to find and it should show up!
Remember, you want to remove the "singleplayer/" in "modes/singleplayer/bounty", on every instance of it. Afterwards, Do not forget to save mod.txt! After that is done, run Cosmoteer with this mod again, and it should work.
I'm not the creator of this mod, but I like to help. Thank you for understanding.