OK.

Welcome to the forums.

Your issue could be caused by prior licence expiry. Allowing your licence to expire can cause connectivity issues. What did you use for an a/v after expiry?

FAQ follows:

Repair avast Premier: https://www.avast.com/faq.php?article=AVKB204#artTitle

Clean install of Premier: https://www.avast.com/faq.php?article=AVKB10#artTitle

Get fresh full version installer of Premier here: https://forum.avast.com/index.php?topic=199715.0