Free Games Settings
Free Game Notifications
Get a Windows notification when a new free Steam game becomes available
SGI periodically checks for new free games and will notify you when one appears. Note that notifications may not be immediate — there can be a short delay depending on when SGI last checked.
To avoid being notified about games you already own, make sure your games list is up to date by clicking Refresh in Your Games.
Auto Redeem Free Games
Automatically add free Steam games to your account as soon as they become available (Pro — Gamer tier)
When enabled, SGI will claim free games on your behalf without any input from you. This requires you to be signed in via the Sign In via Steam button and to remain signed in for the feature to work.
If you enable Auto Redeem, consider also enabling Free Game Notifications so you can see which games were claimed on your behalf.
Also see: What Counts as a Free Game?