Following Shane's answer above (which works great BTW)…
You might encounter a slew of yellow triangles in the reference list.
Most of these can be eliminated by a Build->Clean Solution
and Build->Rebuild Solution
.
I did happen to have some Google API references that were a little more stubborn...as well as NewtonSoft JSon.
Trying to reinstall the NuGet package of the same version didn't work.
Visual Studio thinks you already have it installed.
To get around this:
1: Write down the original version.
2: Install the next higher/lower version...then uninstall it.
3: Install the original version from step #1.