Nexway is a partner of e-commerce with avast! in several countries and therefore they maintain a valid and genuine connection with avast!
Regarding your problem, you received support from the Nexway?
We need a support ticket is created in our system without it we can not serve you.
http://www.avast.com/support
If you have already created a ticket service, tell us the number.
provide your reference number (purchase), contact phone number and e-mail address provided at time of purchase