For some reason, I don't see an option to add it to my library...
The base game is already in my library so I'm not sure what's the reason:
It also says that 9 out of 11 items have been excluded base on my preferences, but nothing changes even after I remove all the filters I've applied years ago. Weird. Maybe it takes time to update?
This DLC didn't require the base game, but it only lasted till 30 minutes before the end of TGA. :/Warframe: Nyx Warframe DLC don't show button there for free to redeem. Sad
The base game is already in my library. Weird.