Premium Security Avast Antivirus, number of devices

Recently purchased the Premium Security Avast Antivirus, which said 10 number of devices would be protected. But, after the activation code was put into the first device. The second device is prompting me to purchase another package, or else the performance issues could not be resolved.
What to do now!
Oh, then no one answers the support email logged - it has been two days and no reply.

Hello tboe, welcome to the community.

I suppose it’s just an ad for another product. In that case you can turn it off by following:
Open Avast => Menu => Settings => General => Personal Privacy => Uncheck 2 boxes from “Offers”