At the end of the setup you're told by the installer to reboot the pc. If this is not necessary, then why this message. Why not an automatic restart of the Explorer.exe process?
In many cases it is not necessary to restart the computer. A restart would only be mandatory for drivers that are anchored/exchanged in the system! GUI-related tools such as START11 are often sufficient to rebuild the user interface by restarting the "Explorer.exe" system service.
And if, contrary to expectations, something still bugs, you can always restart the PC
It's just my very personal experience.
The full (recommended) reboot of the system is just a safe bet from the developer...