This would be an install state issue. Try the following:
- Close all IDE windows
- Ensure all installed files under "C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\Common7\IDE\Extensions\Remco Software" are completely removed.
- Run "C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\Common7\IDE\devenv.exe /setup" as an Administrator. Wait for this to finish.
- Run the MSI installer (http://downloads.ncrunch.net/NCrunch_VS2017_3.12.0.13.msi)
Hopefully that should do it. If not, do the first 3 steps again, then try installing the product manually using
http://downloads.ncrunch...ch_VS2017_3.12.0.13.zip and the instructions at
http://www.ncrunch.net/documentation/manual-installation-instructions. Make sure you follow every step here, especially the unblocking of files .. for some reason people often seem to miss this step (I blame Windows).