The article is wrong on many steps. In fact, following it to the letter will result in nothing working as there are incorrect instructions. Following and adjusting the locations of files as you go (for example where your .pfx file is when you sign the manifests, which changes between steps) works however you get to the end and the system can't find your files to download. In generally it's just wrong steps and I would challenge anyone to reproduce them as-is. I'm currently writing up a (long) blog entry on this entire process (between Visual Studio, MageUI, mage.exe and MSBuild) which will hopefully clarify all of this.