Mir hat folgendes zumindest teilweise geholfen..
"I just spent an hour tearing my hair out, just like you. Deleted everything I could find, and still no luck! Fortunately, I found out about pkgutil when trying to research if other apps have similar issues. Run this command:
$ sudo pkgutil --pkgs If com.microsoft.SilverlightInstaller shows up, it still thinks it is installed. I had to "clean" (kinda) the installation by using the following:
$ sudo pkgutil --repair com.microsoft.SilverlightInstaller After that, I was then able to cause pkgutil to forget about the installation:
$ sudo pkgutil --forget com.microsoft.SilverLightInstaller Hope that works for you!"
die Zeilen mit "$" ohne das $ Zeichen ins Appleterminal eingeben und danach Silverlight neu installieren. Bei Watchever funktionierts jetzt wieder, bei Amazon instant video jedoch nicht - daher wär ne kompetente Antwort sehr hilfreich. Danke