It looks like version 7.3.657 automatically fixed this issue and finally updated my PC!!! Yay!
I'm glad to hear that, @tnwheeler, but a bit perplexed. 7.3.657 is the same version you were previously attempting to install. I don't suppose you're aware of anything else in your computing environment that changed recently?
As far as I know nothing changed.
Weird, but hey, glad it works now!
We are improving our installer for the next update, it should be more resilient.