Your computer may be connected to the internet via a proxy server. That would block any attempt to activate the license. This is fully described in the User's Guide installed with the software.
Please try manual activation by following these steps...
Step 1 - Temporarily disconnect your computer from the internet
Step 2 - Run GBDRegister, you should see the Manual Activation window
Step 3 - Click on the number to the right of the words “Request Number” to copy the value into the computer’s clipboard.
Step 4 - Reconnect your computer to the internet
Step 5 - Click on the link above the Request Number to open the Activation Page on our server
For Windows Plugin https://www.safeactivation.com/activate.php?x=21002022
For Mac Plugin https://www.safeactivation.com/activate.php?x=21002021
Step 6 - Paste the request number into the “Request number” field, and fill in all information on the form including your serial number
Step 7 - Click the Send button. If you entered a valid serial number you will see an “Activation Success” page
Step 8 - Select the number to the right of the words “Activation Code” and copy the value into the computer’s clipboard.
Step 9 - Go back to the GBDRegister window
Step 10 - Click the Manual Activation button.
Step 11 - Past the activation code into the form and type in your serial number
Step 12 - Click “Activate Now” and a new GBDRegister window is displayed
Step 13 - Click the Product License button to display the license status. The status should show the number of days remaining for your license