If you're using a Core Duo Mac, contact the Mac App Store support for assistance or find and purchase an iWork 09 DVD.
If you're using a Core 2 Duo or better Mac, purchase Mac OS X 10.8 from the Mac App Store. If that's incompatible with the computer, phone the online Apple Store and order a download code for 10.7.
I am trying to get Keynotes. And it keeps saying could not complete your puchase and says need version 10.9. How do I get Keynotes I have version 10.7.5 core i7. Would I have to do the same thing. look for a dvd. but I already have pages and numbers so seems to be a bit of a poitless. What should I do