Hi, thanks for sharing this issue.
The MSI for NCrunch uses a VS API to try and find the installation of VS. In the past, we've found this API is not 100% reliable, and we implemented a number of fallbacks ... which unfortunately are also not 100% reliable.
My best guess here is that you probably had VS installed at this path at one time, and there is still metadata pointing to that location, thus confusing the installer.
It's for situations like this that we provide the package also as a ZIP form with manual installation instructions. There just isn't any fixing the MSI to get it to work in every environment. I recommend you install manually.