Keynote file too large to open
I have a huge keynote file. over 300MB that I used for a day long course. Since upgrading to newest version of keynote I can no longer open it - I get a message that reads "you need a newer version of keynote to open the presentation'. I have the current version. Google searches suggest it is too big, and that is the reason for the message. Sooo....
1. Is there a way revert the deck so that I can open it and resave it into smaller modules - to then open in the new keynote?
2. If not, how would you recommend I access the content?
Would love some suggestions.