Wait, he says that you cannot download an application from the internet and run it on your computer, but earlier says that you simply cannot add non-app store a

Wait, he says that you cannot download an application from the internet and run it on your computer, but earlier says that you simply cannot add non-app store apps to the Metro tiled interface. Which one is it? I would assume that you can still install applications from the internet (non-app store), and I'm certain that you can have tiles for those apps. What exactly is the problem?