1. Please login to your DataFile account first: https://www.datafile.com/login.html

( If you don't have an account, please register an account )

2. Then, access this link: https://www.datafile.com/getpremium.html

3. Find this text "If you have invite code", then click to "Click here"

"Premium Key" tab will be appeared, paste Premium Key to "Invite code", and click ACTIVATE