If I understood correctly the check is based on the file dates. So can you post a screenshot with the dates and times of the files in the savegames folder?Yes I already tested your advice by removing bookmark01 .... and yes this is only savegames from this version (0.20)
You can also rename the folder, check the time on your computer and then make a new savegames folder the usual way:
- start the game, let it create the correct folder, quit the gane and copy in that the savegames -- check that they have the correct date
- use the special executable to do it all in one step