One of the most famous game in Hitman series, Hitman: Absolution will be available on GOG for free for a limited time. The game will be DRM free, that is you will not have to activate or you will not need an online connection to play.
Hitman: Absolution is a stealth video game developed by IO Interactive and published by Square Enix. It is the fifth installment in the Hitman series. Before release, the developers stated that Absolution would be easier to play and more accessible, while still retaining hardcore aspects of the franchise.
Here is how you can get the game
1. Visit the GOG page - https://www.gog.com/game/hitman_absolution
2. You will have to login, if you do not have a GOG account, create one for FREE.
3. Click on the Go to giveaway button
4. Scroll down to find the banner and click “Get it FREE”
That's all you need to do
You can install the game using GOG galaxy , or can download offline installer
Also you can get following Hitman games from GOG for just $1.99/game (80% OFF)
Hitman 2: Silent Assassin
Hitman 3: Contracts
Hitman: Codename 47
Hitman: Blood Money