If you haven't yet, please redeem the activation key by going to this website: https://www.asus.com/event/VGA/wtfast/. Just scroll down to the bottom of the page, click the "REDEEM NOW!" button, follow the easy steps and you're good to proceed to the next step!
Then, you'll need a wtfast account with verified payment details (such as a credit card or PayPal.) After you've created an account and verified your payment details, you're ready to redeem your key.
Go to wtfast.com and select Account from the top menu:
Sign in to your account:
Click on Enter Key:
Type in your key. Then click Activate:
If you have carefully followed all these steps and still can’t redeem your key, please submit a support request here. Send us your key in the following format ‘xxxxx-xxxxx-xxxxx-xxxxx-xxxxx’.
Enjoy your bonus WTFast Premium time!