I run Windows 10, and recently installed Endless Space with all it's DLCs through Steam.

Whenever I run the game, it's like it's the first time the game is running. The game's settings won't save, and neither will any of the game data.

Please help... So many countless hours wasted :'(

Usually that is a sign that the game is not running as admin, or that your Win 10 login is not an administrator.