I recently upgraded to El Capitan. When trying to open a pages file I get a message the that I need to download a newer version of pages. When I  go to App store it only gives me the option to open the version of Pages I currently have. Help!

I recently upgraded to El Capitan. When trying to open a pages file I get a message  that I need to download a newer version of pages. When I  go to App store it only gives me the option to...
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