Thank you. First, I've been notified by email that this false positive has been removed.
As to the thread about the end of support for that version referenced by Asyn, I've posted a response in that discussion. I will only repeat here that Avast should directly notify its paying customers, in advance, by email, of events like this rather than requiring us to constantly monitor a website that is largely manned by volunteers to find out about such important news. No, the resellers cannot be relied upon to do this. The only time my reseller talks to me is when they want me to buy another subscription.