I have already purchased license(s), but the license(s) is not enough now, how can I purchase more licenses?

1. Sign in www.gaaiho.com
2. Go to "My Licenses" under "Account" 

3. Click "Upgrade/Buy More" > Buy More

4.Follow the steps: fill in the number of users and other information, and then complete the payment

5. When complete, you will receive a new serial number