I’m not sure I understood the issue, but saves are not backwards compatible, you can use the save from 1.20 on 1.25 but not from 1.25 on 1.20.
in the two days of ´´testing`´ i found out that both .exe so 1.20.exe and 1.25.exe probly take data frome the same save veile so wen i make progres one one the other one updates. only wen i get a 1.25.exe scene the 1.20.exe bricks it self and when i try to start it windows tells my the progrem dosent react and i can clous it or wait for an ancer of the progrem (and the person making the german translation is ´´bad´´ at it some things id do difrent)
The game uses always the same data directory in the computer independent of version, so different versions will write on the same files. Once the save is updated to the next version, it cannot be updated back and is not ensured that it will work on previous versions, most of the time, it will probably crash the previous version because new versions often add new data to the save that previous versions do not support, so the save update tool is only meant for upgrading and not downgrading :).
Regarding the German translation, I can pass on the feedback, but the translations haven’t been updated in a while, it might take some time to have them brought up with fixes.