I have updated to Keynote 6.1, but I still have 5.3 and I cannot open the file I just created in 6.1.

I have updated to Keynote 6.1, my App Store says I did it 2/1/14, I just created a new slideshow in 6.1 tonight, saved it all the way through while creating it, and when finished, saved it one more time, and closed the file. I treid to open it again, but I get an error message stating I need a newer version of Keynote to open the presentation. I check the "About Keynote", and apparently I still have 5.3 and I cannot open the file I just created in 6.1. I try changing the file to open with 5.3, but it won't do that either! The App Store won't let me re-download it. How do I get 6.1 back??? I need to reopen the file I just created.