Huh, there's a bit of confusion between the version numering of the official Kagura translation and the original Japanese Game.
The last Summer Memories (the translation/patch) version is V3.
And the last あまえんぼ version is 1.35 (withouth the "DLC") and 2.06 (with the "DLC").
I think that the numbering between the Steam game and the translation itself are different. So that 1.2 version might just be the Steam version base game. I don't know for sure though, i don't have the game there.
(Sorry if something on the post didn't make much sense, i still need to practice my english a bit more).