This free pack will be available until September 14th and is free for everyone who is signed up for Twitch Prime; you’ll need to link that with your Warframe account, but that is not difficult. It’s also worth nothing that the Trinity Prime bundle is still available as well, and if you’re an Amazon Prime subscriber you already qualify for these free goodies. Just take the time to grab them and they’re yours forever.
Warframe’s free giveaways for Twitch Prime subscribers yet? No? Then what are you even doing with your time? Do you need to get more stuff before you’ll take notice? Because the developers are going to give you more stuff. Seriously, the game just added a new pack for Twitch Prime subscribers adding in 50 Platinum along with a 7-day Affinity booster and a 7-day Resource booster.
Source: Official Site; thanks to Sophiskiai for the tip!