"not compatible across versions" is quite a strong indicator how much (or more not so) you value the time of your customers and that most likely something is wrong in your game development decisions. Just sayin'.
Just saw this, so forgive the late reply.
I'm afraid your remark is misdirected as I'm not affiliated with the devs in any capacity, just a regular GOG user posting changelogs as they become available.
I suggest you contact the devs directly.