Humble Store has been giving away quite an amount of interesting games recently and this time, they're giving away 'Outlast Deluxe Edition' worth $28.98 for a limited time only.
To claim your free copy of Outlast, kindly visit the following link to Humble Store at https://www.humblebundle.com/store/outlast-deluxe. Do note that you will need to get yourself registered at Humble Bundle in order to claim this limited time offer. The redemption deadline is October 7th, 2017 at 10:00 AM Pacific, so do activate the key given once you've received it.
You will be guided to the page as seen in the screenshots above, just scroll down to the bottom of the page to get the key you need to activate the game.