Welcome to the Forum!
Unfortunately, PT First only runs plugins purchased through the Avid Store:
http://avid.force.com/pkb/articles/e...s-First-FAQ#16
Q) Can I use any AAX plug-ins with Pro Tools | First?
A) Over 20 plug-ins are included with Pro Tools | First including the Xpand!2 Virtual Instrument. Pro Tools | First supports AAX Native 64 and AAX AudioSuite 64 plug-ins purchased from within the in-app Store. Check the description/specs in the Avid Marketplace to confirm if an iLok is required. Plug-in bundles which include ‘First’ in the name are specifically designed for use with Pro Tools | First and do not require an iLok. These plug-ins should download and automatically install, without needing to re-launch Pro Tools. Plug-ins purchased through the Avid Marketplace with your Avid Master Account will work with Pro Tools | First. Some plug-ins installed manually (outside of Marketplace) will work with Pro Tools | First, but most plug-ins will remain hidden and unavailable at launch. If you purchase plug-ins for Pro Tools | First then upgrade to Pro Tools, those plug-ins will be available as the AAX Native 64 format is exactly the same for Pro Tools | First and Pro Tools.
Q) AAX 64-bit plug-ins require an iLok, but Pro Tools | First doesn’t, so can I use these plug-ins?
A) Many 64-bit AAX plug-ins from Avid and third-party manufacturers do not require an iLok to use and are ideal for use with Pro Tools | First but must be purchased from within Pro Tools | First using the in-app purchase feature. You may also choose to purchase and use any AAX Native 64-bit plug-ins from the in-app Avid Marketplace that require an iLok, but you will need to purchase an iLok USB Smart Key separately to allow activation of these plug-ins.