iWork apps do not update
I have recently upgraded my 2012 Macbook Pro from Mountain Lion (10.8) to El Capitan (10.11). After that my Microsoft Powerpoint (from Microsoft Office 2011) stopped working. This is a known problem. So I wanted to go back the Apple app Keynote. I found in my App Store that all the iWork apps (Keynote, Pages and Numbers) appears under the list 'Purchased'. But when I try to update them it does not do anything.
MacBook Pro 13″, 10.11