I just upgraded to Mavericks on my new Macbook Air and I am facing issues downloading apps from the Mac app store.
When I click on the install button on any app, it does the usual animation of jumping into the Application folder and then the button immediately says installed. If you go to the dashboard you can see the new app icon with the progress bar inside it which has moved all the way to the end and the cancel button on the upper left corner. It remains this way forever.
No it doesn't matter if the app is big or small; it always behaves this way although I have had random apps succeeding.
The problem is not just the fake complete notification, the app never gets installed and sometimes it gives an error saying that the download failed and asks me to retry again from the purchases menu in the App store.
I have even done a complete re-installation of Mavericks but it did not help.
PS: The first time I upgraded to Mavericks, I was able to download Pages and iPhoto without any issues. The problem started sometime after that.