Error in the AVG licensing renewal

I have found a technical problem in the AVG licensing renewal (Checkout process).
 
Here are the steps I have made:
 
1. MyAccount » My Subscriptions;
 
2. I click on "Renew early";
 
3. I select: "2-years";
 
4. Then I select "PayPal";
 
5. I click "Agree & Buy";
 
6. I receive the following error immediately:
 
"Checkout process error
An internal error occured.
Unforunately an error occured and your request can not be completed.
Please try again later.
If the problem still persists please contact our Customer Service.
We apologize for any inconvenience."
 
I also tried from other PCs on different days and the problem remains.

Hello Antonio,
We understand how something like this can really try your patience.
We request you to contact our AVG Sales team via the following link to assist you better. Please click on the following link https://support.avg.com/support_sales?l=en_US and choose "Chat us online" at the end of the page. One of our representative will check this for you. Please feel free to contact us for any further assistance.
Have a great day, Gulam AVG Customer Care