You don't need to install VS 2012 on your server. You probably only installed the x64 version of the Visual C++ Redistributable 2012. You should install the x86 version of the redistributable if you want to use Magick.NET-Q16-x86.
If you want to convert a PDF file to an image make sure you also install Ghostscript on your server.
If you want to convert a PDF file to an image make sure you also install Ghostscript on your server.