Running this will install the fw and sw at the location below:
C:\Program Files (x86)\IVI Foundation\IVI\Microsoft.NET\Framework32\v4.6\Raytheon.GuidedElectronicsUnit 1.2.5

The sw/source that gets installed has been relocated to ComposableTestSoftware\Source\Common\COTS\Teradyne_SDLC
   - Modifications to this source should be made through the ComposableTestSoftware ADS repo

Nimbus SDK:
Then in VS under Tools/Options expand NuGet Package Manager and select Package Sources.  
Click the add button and enter that same path in the source box (or just browse to the file). 
You should be able to open the project after that.