Updated to the latest AIS version (see sig below) without issue. This was done after I uninstalled the previious version18.3.2333 and then installed Spring Creators Update 1803 with just Windows Defender running.
As always, this is a clean install using the full offline installer. No issues whatever. Well, almost none. I show (1) shield disabled, same as before.
What is notable is the vastly improved built-in help section found in the new Menu drop-down. Nice. Cold boot start-up time is around 50 seconds to desktop with avast installed, 42 seconds with Windows Defender.