Wampserver Upgrade 3.3.1 to 3.3.7 "preparing to install..." (3 replies)

I have 2 computers that are nearly identical in setup (one to serve as a Development environment and one as live). The development environment went smoothly, but today trying to upgrade the main server from 3.3.1 to 3.3.7 when I run wampserver3_x64_update3.3.7.exe, I click next at the "Wampserver colors" screen and then it sits at "Setup is preparing to install Wampserver 3 Update on your computer" indefinitely. It doesn't matter if I EXIT via wampmanger first or not... it just sits there. I let it sit for over 30 minutes.

Any ideas?