Here's what I did:
Opened UI, Maintenance, Update and clicked Update Program.
Update completed, selected No to reboot as I was on-line browsing the forums.
Disconnected and restarted my computer, no problems.
Whilst it may well be worthwhile to create a Restore Point (I don't use system restore, but hard disk imaging), since I didn't have any issue with the 5.0.377 install over 4.8 I didn't feel the need to take special measures.