Why Can't I open spreadsheet on my Mac Book?

Why Can't I open spreadsheet on my Mac Book Pro? I have gone to the App store to download the most current version of Numbers, but am told it is already installed. The version of Numbers on my computer says it is 2.3 (554). ( in "about Numbers"). If it is already installed why can't I open a spreadsheet created long ago, but used recently without any problems until today. Very Frustrated. I have Maverick on my 2012

Your Mac is too old. See http://support.apple.com/kb/HT5842 .
Also, a Mac with 2 GB of memory does not run well on Mavericks.

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Why Can't I open spreadsheet on my Mac Book?

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