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please have a look at the walk-through document that is linked into the main post. There is a chapter right at the beginning on how to import save games.

"Old saves must be from a safe-zone for import."

It says right there in your own screenshot what you have to do.

Go back to the previous version (I hope you still have it), and make a save when you are on the "Day XXX" screen, the first screen of every new day. You'll see a small note in the corner saying it's the safe zone.

That save can then be imported into the new version.