Pretty good deal for a fantastic game - I recommend the GOTY edition.
Yes, the key says it is for Mac but that is due to publisher. You redeem the key as normal on Steam and can then download the version for your OS.
From the website: Borderlands 2 GOTY:
WITH BORDERLANDS 2 GAME OF THE YEAR EDITION, players can experience every epic boss battle, increase the level for each of the six playable Vault Hunters, play all of the additional campaign content, and enjoy hundreds of hours of shoot-and-loot mayhem at an extraordinary value.
Content included:
AWARD WINNING TITLE, BORDERLANDS 2
4 ADD-ON CONTENT CAMPAIGNS
- Captain Scarlett and her Pirate’s Booty
- Mr. Torgue’s Campaign of Carnage
- Sir Hammerlock’s Big Game Hunt
- Tiny Tina’s Assault on Dragon Keep
2 NEW PLAYABLE CHARACTERS:
- Gaige, the Mechromancer
- Krieg, the Psycho
FIRST LEVEL CAP INCREASE
PLUS NEW BATTLE ARENAS, HEADS AND SKINS, GOLDEN KEYS AND MORE!
Enjoy!
hahahaha. borderland 2 and civilization 6 are on discount now ~~~~ (after release of EPIC free game plan)