A little while ago a rumour started doing the rounds that Gearbox Software will release DLC for Borderlands 2 to get players ready for the launch of Borderlands 3 this September.
I believe on PC you just need Borderlands 2. If you check the trailer they released, right at the end it says you have to own Borderlands 2 or Handsome Collection in the fine print at the end.
Can confirm it loads with just BL2 installed. But as an FYI, the Complete Handsome Collection is on bundle sale on Steam right now for R67. It’s one of those bundles things that checks what you already have in your library and then gives all the missing parts, so if you have BL2 already it’ll be even cheaper for you.
I think it was set as a Weekend Deal so it might expire at around 7pm tonight, though I’m not 100% sure about that.
Also important to note is that’s its only free until July 8. So if you own the game and don’t plan on playing right now, make sure you at least grab the DLC.