1. Please log into your AlfaFile account first.
( If you don't have a AlfaFile account, you just need to register free account: https://alfafile.net/user/signup )
2. You will receive a premium key / coupon that you can activate here: https://alfafile.net/payment/coupon
3. Please enter your coupon code in "Coupon Code" and click "Pay" to become Premium user.