Same issue!
Do you have Norton installed?
I have noticed that Norton 360 does not even start. The uninstall process did not complete, so I can't verify if it is still running, but the installer does not run as well - it crashes.
heitorsj
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Same thing on the MacBook Pro 17 A1707. I have halted the upgrade on the other Macbook.
Do you guys have Norton running?
The installer does not even starts...