This is Borderlands 2 standalone version 1.3.1.

All additional content and options are available (all tested):

• Mechromancer Pack: available when you choose a character class.

• Creature Slaughter Dome: enter at the far east of "Wildlife Exploitation Preserve".

• Captain Scarlett and her Pirate's Booty: Fast Travel to "Oasis".

• Mr. Torgue's Campaign of Carnage: Fast Travel to "Badass Crater of Badassitude".

• Sir Hammerlock's Big Game Hunt: Fast Travel to "Hunter's Grotto".

• All appearance customizations are available, including all 15 Madness, Supremacy and Domination packs.

• From the Premiere Club Pack: characters get the Vault Hunter's Relic and Gearbox GunPack. Plus, you get 255 Golden Key instead of a measly single one!

• From the Collector's Edition Pack: Contraband Sky Grenade.

  Other changes (all tested):

• When opening the loot chest in Sanctuary, you don't loose a Golden Key (but you still need one). Yeah, you can loot that golden chest as often as you want.

• English, French, German, Italian and Spanish localizations are included.

• Standalone version: no Steam connection required.

Limitations:

• As this is a standalone version, all functions requiring Steam can't (and won't) work, so: no internet game, no Shift Codes... Don't lament, go buy the game. However, LAN multiplayer games do work (tested between two Macs).
• LAN games version restrictions still apply: don't mix versions of Borderlands 2, be it PC or Mac.