@RDunn: It is correct that a reboot before update/install will make registering the .DLLs for symbol and schematic preview more dependable. The installer does everything it can to make it as reliable as possible: Closes all invocations of Windows File Explorer, unregisters the old .DLLs, wait up to 10 seconds for the OS to release the .DLL so it can be updated, but it can still fail. I have noticed that if you close all other applications, it’s somewhat more dependable. MS Office and Teams seem to be particular offenders. But even then, it still can fail.
But the good news is there is no advantage to rebooting after installation.
–Mike