Visual Studio 2010 Build Tools V100 Link Download
Finding a standalone "Build Tools" installer for VS 2010 is difficult because this specific packaging started with later versions. To obtain the v100 tools, you generally must use one of the following official channels:
The SDK installer did not set Windows SDK version correctly. Fix: Run vcvarsall.bat x86 manually before each build session, or define: Visual Studio 2010 Build Tools V100 Download