Pages document won't open after migration to new computer

I used Migration Assistant to move my apps to a new computer. It's running Yosemite. The old computer was running Mountain Lion.

When I try to open a Pages document, the new computer says I need a newer version of Pages. But, I have the latest version, 5.5.3.

Anyone encounter this and have a fix? Calling Applecare is like pulling teeth or me. I appreciate the help I can get on ehmac.

via ehMac.ca http://ift.tt/1KuVNey