Update: This offer end on 04-June-2020. 
In order to get for FREE and keep it forever, you need to:
- Login to Epic Games Store
Get it here : Borderlands: The Handsome Collection
BORDERLANDS: THE HANDSOME COLLECTION includes:
- 2 critically acclaimed BORDERLANDS games in one package
- All bonus add-on content, adding hundreds of hours of gameplay at an incredible value*
- Cooperative gameplay for up to four players
Grab it fast. Enjoy!!!