can't open a keynote document because I need a newer version
I created a presentation using Keynote 5.3 (1170), modified and used it in April of this year, however now all I get are pop-up windows that say I need a newer version or I don't have permission to open it. I have tried to set the "Open with" setting to Keynote.app (5.0) without success. Is there any way I can recover this document? I made a serious mistake and downloaded the new iWork apps and tried them out only to decide that a lot of features that I use had been left out. I subsequently banished those apps from my machine. My OS is 10.9.5.
Mac Pro, OS X Yosemite (10.10.4)