What is ‘Virus Total’ and what it be necessary to check it or is it just additional information since Avast already takes care of blocking it?

Is 2015.10.2.2218 the latest ‘regular’ Program Version or is 2015.10.3.2219 the latest Program Version but only in beta mode and should not be relied on yet?

Second, will the Beta Program Version 2015.10.3.2219 be installed during the next automatic update, installed during the next manual update, automatically/manually installed as an update once it is out of ‘Beta’ mode, or will the new version have to be installed as a separate file only when it is out of Beta mode