We have different product installers for each specific version of Visual Studio.
If you are downloading the installer for Visual Studio 2012 then you need to install it into Visual Studio 2012 as it will not install into any other version of Visual Studio.
If you do not have Visual Studio 2012 installed then the Visual COBOL installation will install the Visual Studio 2010 shell version and install itself into that.
Our current product release of Visual COBOL 2.2 supports Visual Studio 2010 and Visual Studio 2012 fully and we have a technical preview (beta) available for Visual Studio 2013 although this is not available in a Personal Edition version.
Our next product release which is Visual COBOL 2.2 update 1 will fully support Visual Studio 2013.
This will be available in June for a full licensed copy, although I am not sure exactly when the PE version will be available.
Thanks.