I don't know if this has been mentioned or not; I don't have the time nor the inclination to read through all 22 pages of the thread, but...
I just dl'd the mod; 1 gig! Took over an hour! Extracting with RAR took 10 minutes! Then when I looked over the file structure, I found out why. There are numerous duplications. Within the Art folder are two other folders that don't belong: TAC1 & TAC2. These duplicate the main Art folder and even duplicate each other. They really ought to be cleaned out so as to reduce the amount of data in the download. Way too big.
Yes, it's true. There are some duplications that in the next update I will delete all. Actually I work at a major update with many changes and I hope to upload soon. But the size of the Mod will be big because there are much flavour units for each civilization.