I'm nervous about this as well. I'm about to setup my first new PC since the problem. The Windows 8.1 Pro system will have that KB installed prior to joining our domain, so when Avast installs, hopefully that emupdate runs immediately so the system doesn't hang up.
Edit: A fresh install does not seem to update itself. It installs - runs the memory scan - then runs the standard VPS update. After that - nothing. The affected DLL file doesn't change. If I force the emupdate to run, then the DLL was updated and I could restart.