Local Install still on "Checking System" - Choosing "Quit" Function indicates all sites will be shut down - MacOS

Very new to local development process and Local install (after removing previous Local/Virtual Box installs, previously) is stalled on “Checking System” - and if I try to quit - says all my sites will be shut down, but unknown if by downloading while logged into Flywheel account means it’s loading all my existing sites, and will shut down all my live websites - OR if it is generic warning -

Help!! Shall I wait/continue? or should I quit, because warning only applies to local sites done before, of which, I have none?

Sigh - when you put cool tools in hands of noobs - who wish to learn, but…

Working on 2011 mac, on HighSierra OS