Cant activate premier

Hi I bought premier yesterday paid for, but I have received no email. I have tried to input the licence key but it states that it is not valid. Help please. I do not want to have paid for this and not to be able to use it.

Hi I bought premier yesterday paid for, but I have received no email.
have you checked mail client or webmail spam filter?
I have tried to input the licence key but it states that it is not valid.
where did you get the license key from if you did not recive any mail?

Need your purchased Avast license sent again? https://www.avast.com/en-eu/resend-license-paid.php

avast support https://support.avast.com/

avast FAQ https://www.avast.com/en-eu/faq.php