Numbers won't open; requires update. No update available. File created on version installed.
I created a file using Numbers currently on my Macbook Pro (early 2011).
OS X v. 10.11.6
Numbers v 3.6.2 (2577)
The file is stored in my iCloud folder and will no longer open on my Mac saying it requires the updated version. When I go to the app store using the link it provides, it has a button to update that does nothing. When I go to the Updates tab, no update available. I also have not updated or changed anything on my Mac since the last time I used the file.
Please help!
MacBook Pro