How do you uninstall Keynote 6 but leave Keynote 5?

I installed Keynote 6.x recently, and decided I want to use the old version (5.3) - commonly known as iWork '09 instead.

I have deleted 6.x Keynote using Finder, but it comes back when the App Store does software updates (which also sets *.key files to open in Keynote 6.x). I can't figure out how to get the App Store to prevent Keynote from coming back...


Solution 1:

Open System Preferences and click on App Store

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Uncheck "Install app updates" (and probably "Download newly available...")