I have a game installed with GoG Galaxy 2.0 on a Macbook Air and I am trying to sync to local save files so that I can load them on a PC. However, when I go manage installation -> configure -> features, it has the check box to sync local saves with GoG Galaxy Cloud, but it won't allow me to select it.

lets start with the name of this random game because that decides which options are even possible

then to be clear, it is the Mac system that won't sync or the Mac will and Windows one doesn't?

The game is Star Control 2. Neither the Macbook Air nor my PC will allow me to check the box for sync local files with the cloud.

yes the star controller games are Dos-box and they don't sync becasue they are too old