Hint for an online archive.
To use the v90 toolkit for the platform (= Visual Studio 2008) in the new Visual Studio (I am testing 2013 and 2015), you need to additionally install Visual Studio 2008 and Visual Studio 2010 (possibly after installing VS2008), since the definition of the vs90 platform toolkit is The MS Build program folder is part of Visual Studio 2010, not part of Visual Studio 2008, and not part of Visual Studio 2013.
The first answer to installing the entire version of Visual Studio is fine, and the answers to reinstalling Visual Studio 2013 or installing Visual 2013 after Visual 2008 will not work.
C:\Program Files (x86)\MSBuild\Microsoft.Cpp\v4.0\Platforms\x64\PlatformToolsets for v90 and v100 (both installed by Visual Studio 2010)
C:\Program Files (x86)\MSBuild\Microsoft.Cpp\v4.0
for V110 V120 and V140 (installed by the corresponding version of Visual Studio)
representing Visual Studio versions: v90 = 2008, v100 = 2010, V110 = 2012, V120 = 2013, V140 = 2015.
Immediately after installing VS2008 and VS2010, the new version of Visual Studio 2013 + 2015 can use the platform tools vs90 and vs100. There is no need to reinstall Visual Studio 2013/2015.
source share