Here's a quick guide from the Discord on how to transfer your saves from an old Axugaem2 update's folder to the new one.
1) Find your old Axugaem2 game folder (it'll be wherever you saved it.)
2) Locate the save files (they should be in the main game folder and named something like Save01.rvdata2). Copy/paste the save files somewhere safe (like dropbox or your desktop; anywhere you'll be able to locate them.)
3) Delete the Axugaem2 folder.
4) Download and unpack the new update!
5) Copy/paste your old saves into the new update's folder (in the same place as they were in the old folder.)
6) Start the game up and enjoy!