Problem with Numbers App
I have two versions of Numbers on my Mac: Numbers 09 version 2.1 (436); Numbers 3.5.2 (2118)
I kept Numbers 09 because I liked it much more than the newer version. It continued to work well with documents that had been created on it. With some other spreadsheet documents I would get the message "The document *****.numbers is invalid. The index.xml file is missing". When this happened I would close Numbers 09 and open the other one, and the file would open. This worked very satisfactorily.
Now something new is happening. When I try to opencertainvNumbers files made in version 3.5.2 I get this message: "You need a newer version of Numbers to open this spreadsheet".
When I go to the App store and try and upgrade Numbers, which I have done several times, nothing happens. The little wheel spins indefinitely, and the app won't download. Also I notice the new version has a rating of 2.5 stars, which is not very encouraging.
There appears to be a certain randomness about what happens. I've tried to narrow down exactly what happens in exactly what conditions, but in doing so inconsistent things appear to happen.
Can anyone out there help?!
I'm using a 2009 21" iMac running el Capitan 10.11.6
iMac 21.5", 10.11