HonzaZ:
I ‘might’ install Libre Office but I would like to resolve the WPS/Avast conflict first because, up until last night, there was not an issue. The latest versions of Avast and WPS are installed.
I emailed officesupport@wps.com and will provide an update once I receive a response from them. Maybe HonzaZ wants to email them as well since he understands my issue and could probably provide a better description of this issue? 
-To be clear about a detail, even though Avast is displaying a pop-up ‘Threat Blocked’ message each time WPS is opened, I can still access my individual files without any issues so what exactly is being ‘blocked?’
-I wonder if uninstalling and reinstalling the software will resolve the conflict?