Hi, thanks for the quick fix!
I cannot say, whether it will be downloaded, because I downloaded the BZ mods through the Very BZ-Modpack-Mod.
I started a FITS playthrough with a bunch of BZ mods (including natural gas) before you added the dependencies (for BZ resources I have used the Sun Resources mod) - by the way I had so much fun with building a very tight spaghetti base! :)
I just loaded the old save with the wrong BZ dependencies and in the mod-browser in Factorio the FITS mod is marked red and it does not load the FITS mod.