Download and install Origin.
https://www.origin.com/en-us/download
Launch and log into Origin with the account that had it gifted/purchased on.
Go to your "games" tab and make sure that "All" are selected. Make sure it isn't in a hidden section. It should show up there so you can download and install it.
*edit.. wait 2011.. this can't be Garden Warfare. The above should still be true if it's an Origin title.
