According to the Dot Net Obfuscator documentation (Dotfuscator short circuit) is pre-installed in VS Studio 2012.
It can be found in Tools → Dotfuscator Software Services .
However, there is no such thing:
Is Dotfuscator added by default on Visual Studio 2012/2013 Express?
Dotfuscator is only included by default in non-express SKU Visual Studio. This is true for all versions of Visual Studio (currently 2010, 2012, and 2013).
IIRC Express , , ,