Certain releases of Visual Studio 2017 did not come with the required prerequisites installed, and the VSIX package for the Add-In failed to include the needed prerequisites.

Until a new VSIX file can be published and pushed to Microsoft, in order to be able to install the VSIX for use in VS2017, the "Visual Studio 2013 SDK" will need to be installed on the computer where you want to run the Add-In.

After installing the VS2013 SDK, exit (if it was running) and relaunch Visual Studio 2017, and attempt the AddIn install again.