DavidR
2
Provided your are within the 30 day refund it shouldn’t be a problem. You might want to ensure that any auto payment renewal instruction is cancelled.
Support Ticket Refund - https://support.avast.com/support/tickets/new?form=2
Sales - Orders and Renewals FAQ - https://www.avast.com/faq.php?article=AVKB24#artTitle.