trouble with updating pages - What can I do?

Hello,

I have a problem with my mac, Some days ago I updated my mac to OS X El Capitan, because I wanted to use the new version of the iWork products. But after I updated my mac, I cannot update pages on the MacAppStore.

I don't understand why, because I was able to update Keynote and Numbers without any trouble.

I am using OS X Elcapitan 10.11 and version 5.5.3 of Pages.

When I try to updatem a window comes up and tells me that there is no update available for my AppleID. It says that pages might was bought from another account or it was cancelled.

I haven't done any of this causes.

It would be great, if someone is able to help me.

Thank you