To redeem a promo code for the FAST Bundle, go to the FAST Bundle page and click Buy Now.
Then select Buy Now if you are using the code for the one time payment option, or Setup Payments if you are using the code for the subscription plan.
Login with a Collective account, or login with your Focusrite/Novation account.
Scroll down and click I have a coupon code.
Enter the coupon code and click Apply.
Click Buy Now.
If you haven't already done so, download the plugins by clicking Download Now. Then watch the activation tutorial.