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The Catalina Update says Desperados won't work on OS 10.15 - i hope there will be a fix??
now i moved to Windows just to recognize the savegames are not synced - damned! The old cheats also don't work so do I really have to begin again??
The game saves are located in ~/Library/Application Support/THQNordic/Desperados

In most cases – if the save data has the same format between platforms – you can simply copy these files to the corresponding location on Windows, even if Galaxy doesn’t support syncing the save data.

It seems that the developer won’t support Catalina. Mac support is no longer mentioned on the GOG store page and the corresponding Steam page shows an incompatibility warning for Catalina. Pretty sad that the “modernisation” in 2018 was so short-lived.