Take a look at the Flywheel Help doc on this:
How to uninstall on MAC?
Stuck on "Starting Local Machine"
Local Crashed and Now Won't Install After Uninstall
The Site Can't Be Reached
Installation blocked at third step (Local Image)
None of my sites start after upgrading to 2.3.2 from 2.3.x Pre-release
Resolved - Remove SSL Redirects
Updated to 2.4.3 Now hangs on checking system
File not found error when trying to open Local