This is part of GMG's VIP sale and requires a few steps to get the deal:
- Click Get Deal.
- Login or create an account at GMG.
- Once logged in you should be redirect to the VIP discount page.
- Top right of the page, you'll see The Witcher 3 on sale for $35.99.
- Click "Buy Now" to add the game to your shopping cart.
This is the DRM FREE version of the game and you'll be able to redeem it and activate the game here.