I played the game on a PC with cloud sync enabled.
After I go to another PC, install the game, but the saves are not showed in the game.
Also the save dir is empty... but I think this is because cloud sync...

So how can I recover the saves?

unless I'm mistaken, the game itself doesn't offer cloud save. or rather, GOG doesn't offer cloud save for that game specifically.

It boggled my mind too that could saving isn't offered for all games, it became a deal breaker for me. but it's the same with steam too,