Can't open Pages file
When I attempt to open a particular Pages file, I get the message, "You need a newer version of Pages to open this document." I am using the latest version of Pages (vs.5.5.3) so that's not the cause of the problem. I suspect the file is corrupt because of two things. (1) When I put the file in iCloud and then attempt to open it from there, I get the message "This document cannot be opened." (2) I noticed that when I do a right-click on the file, one of the choices is "Show Package Contents" but that choice is not present with any other Pages file.
I went into Time Machine to try to find an older version of the file but I don't have one.
Any suggestions as to how to retrieve this file and get it to open?
iMac, OS X Yosemite (10.10.5)