Transfer AVG from 1 PC to multiple PCs

Hello Ton, 
Thank you for contacting AVG Community Support.
We understand that you want to convert your single device subscription into multi device subscription. We are glad to help you.
Could you please contact our AVG billing & sales team using this link: https://support.avg.com/support_sales_chat?l=en.
They will check and help you with purchasing and upgrading your subscription into AVG multi device subscriptions. 
Thank you and keep us updated.

I have a subscription for 1 PC but want to convert it to a subscription for multiple PCs 
But I can't find how to do that 
thanks in advance for the help

Hello Ton, 
Thank you for contacting AVG Community Support.
We understand that you want to convert your single device subscription into multi device subscription. We are glad to help you.
Could you please contact our AVG billing & sales team using this link: https://support.avg.com/support_sales_chat?l=en.
They will check and help you with purchasing and upgrading your subscription into AVG multi device subscriptions. 
Thank you and keep us updated.