The mod likely won't be finished until version 1.0 ^^
in V0.41 3/6 of the troop trees are finished and native names are used for locations and heroes, in V0.5 all 6 faction troop trees will be finished and all locations and heroes will have different names.
Yeah it might be hard to patch 0.41 to 0.5 with all the new stuff.
The reason for such a download size is because of all the new items. (0.5 will feature more then 1,000 new items)
We will do our best for easy patching in the future