That was actually my first course of action.
I also tried:
bcdedit /set testsigning on
bcdedit /set loadoptions DDISABLE_INTEGRITY_CHECKS
So, I reinstalled the OS, attempted to reinstall Hamachi, and ran into the same error.
This time I unintalled Hamachi, downloaded and applied KB3033929, restarted, and reinstalled Hamachi.
Now it works!
Until the Hamachi driver becomes digitally signed by MS, I'll keep KB3033929 on my installation list.
Thanks for your help Consultant64!!