It's been a long time since I posted and then haven't been back to read the replies. Now I find that one computer is still at 5.0.377 and still says that 5.0.418 is available but clicking Update program doesn't do anything. The other computer is now at 5.0.677 which I assume is the latest. Why, per the last reply, would I have to uninstall and run a special utility, i.e., why doesn't first computer show that .677 is the latest and just install it on .377?
I will try to check back soon for an answer, or maybe start a new topic.