New answers tagged compatibility
I had the same error message as Stefan on opening. I fixed the problem by installing Silverlight 5.1.41212.0. I'm running: El Capitan 10.11.4 (15E27e) (beta) Late 2015 Retina iMac i7 4GHz So providing you've got the correct version of Silverlight installed, you should be able to run it.
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