I just started playing Civ4 a month ago and recently found this mod. Big thank you to you guys for working on this over the years, it's a great mod!
I had issues installing on a steam installation and wanted to post what I did, because I encountered a bunch of the issues other have been having, but none of the solutions in the posts worked.
What didn't work:
I installed using the installer for 1.83. It gave an error about a missing folder ("\mods\final frontier\") and then looked like it installed successfully. Upon launching the game, it gave a cfg error and then hung.
I tried using the standalone zip install for 1.83. The game loaded, but there were no planets and a borked UI.
What worked:
I installed using the 1.83 installer. First I had to copy the Final Frontier mod to "c:\mods\final frontier" from "c:\Program Files (x86)\Steam\steamapps\common\sid meier's civilization iv beyond the sword\Beyond the Sword\Mods\Final Frontier"
When specifying a location to install, use "\Steam\steamapps\common\sid meier's civilization iv beyond the sword\Beyond the Sword\Mods". The installer should automatically add "\Final Frontier Plus"
After this, the installer for the 1.84 and 1.9beta patches each worked.
Hope this helps!
-Ben