When trying to install some node.js packages (sqlite3 and socket.io in particular) using
npm install socket.io
error MSB8020: The builds tools for Visual Studio 2010 (Platform
Toolset = 'v100') cannot be found. To build using the v100 build
tools, either click the Project menu or right-click the solution, and
then select "Update VC++ Projects...". Install Visual Studio 2010 to
build using the Visual Studio 2010 build tools.
To get around this on my machine I did this command to install the package:
npm install socket.io --msvs_version=2012
I found the answer here when having the problem with installing sqlite3 and it worked with socket.io as well.
These might be more permanent solutions to fix the problem: