They are if you wait for the translation project qsp file. Since
Xorgroth ALWAYS makes sure the variables remain the same and he has even an built in save updater.
If you want to "be first" then you play the QnD machine translation without a warranty that anything will work.
Oh and the 12GB is for the base - the delta updates are smaller.
I sometimes wonder --- people expect a quality game, with real porn and lots of content, but they also expect that such a game would be like.... 1 GB? If you are using animated stuff... gifs avis or webms then this is virtually not possible.
Avenger already switched the format from gifs to webm thus improving the quality and reducing the size....
AND -- you get this stuff for free here... Xorgroth, dspeed, sknf or me (or other modders that I forgot) are investing countless hours in it...
yet... some people still complain...
I mean I got you- this game is big. 0.29 was the last update where Avenger did some bigger changes to the base. From now on if you keep it up to date you can use the deltas (having the full 0.29 base). Hopefully this will make you happier?