PS C:\windows\system32> npm -g --add-python-to-path --vs2017 install windows-build-tools node-gyp
C:\Users\Admin\AppData\Roaming\npm\node-gyp -> C:\Users\Admin\AppData\Roaming\npm\node_modules\node-gyp\bin\node-gyp.js

> windows-build-tools@5.0.0 postinstall C:\Users\Admin\AppData\Roaming\npm\node_modules\windows-build-tools
> node ./dist/index.js



Downloading vs_BuildTools.exe
[>                                            ] 0.0% (0 B/s)
Downloaded vs_BuildTools.exe. Saved to C:\Users\Admin\.windows-build-tools\vs_BuildTools.exe.

Starting installation...
Launched installers, now waiting for them to finish.
This will likely take some time - please be patient!

Status from the installers:
---------- Visual Studio Build Tools ----------
2018-12-14T20:11:16 : Verbose : [InstalledProductsProviderImpl]: Stream was closed
2018-12-14T20:11:16 : Verbose : [InstallerImpl]: Rpc connection was closed.
2018-12-14T20:11:16 : Verbose : [InstallerImpl]: Stream was closed
2018-12-14T20:11:16 : Verbose : [SetupUpdaterImpl]: Rpc connection was closed.
2018-12-14T20:11:16 : Verbose : [SetupUpdaterImpl]: Stream was closed
------------------- Python --------------------
Python 2.7.15 is already installed, not installing again.


Could not install Visual Studio Build Tools.
Please find more details in the log files, which can be found at
C:\Users\Admin\.windows-build-tools

Skipping configuration: No configuration for Python or Visual Studio Build Tools required.
TypeError: Cannot read property 'then' of undefined
    at install_1.install (C:\Users\Admin\AppData\Roaming\npm\node_modules\windows-build-tools\dist\start.js:19:17)
    at launch_1.launchInstaller.then.then.then (C:\Users\Admin\AppData\Roaming\npm\node_modules\windows-build-tools\dist\install\index.js:34:9)
    at process._tickCallback (internal/process/next_tick.js:68:7)
+ node-gyp@3.8.0
+ windows-build-tools@5.0.0
updated 2 packages in 173.711s