You have to go into the FS22 folder like you were going to add a mod but instead create a new savegame folder that has any empty slot in the main menu. Say if game #2 is open on the main menu then make new folder savegame 2. Find the save game you downloaded and open it. Highlight a file and hold CTRL+A. That will highlight all files. Then SImply drag those files into the empty save game folder and it should work.