When I am trying to install CMake I get the error:
Visual Studio 15 2017 could not find any instance of Visual Studio.
I am using Windows 7
Try downloading the windows-build-tools package.
npm install --global --production windows-build-tools --vs2015
This step should be the end-all-be-all solution to fixing node-gyp problems. For most people, that’s true. NPM has a package called windows-build-tools that should automatically install everything you need to get node-gyp working, including the Microsoft build tools, compilers, Python, and everything else required to build native Node modules on Windows.