I am using a MacBook for work now. Got a stuck installer, trying to restart the computer.

Messages (not exact quotes).

The system: cannot restart, please exit installer [Cancel], [Try again].

Installer: Installer is busy, cannot close window. [OK]

Check and mate.

Fortunately, the restart attempt must have killed some processes that were interfering with the installer, so it went on. Otherwise, I am not sure what I could do: this thing doesn’t even have a power button!

Oh, well.

PS. Upon shutdown/restart Windows kills stubborn processes after 30 seconds if they don’t cooperate.