All of a sudden I can't open some InDesign files. Get a message saying: "cannot open XXX because it was saved with a newer version of Adobe InDesign (CS7.3) -- but somehow that has disappeared off my computer. What do I do? I have older versions, CS4 and CS5.5 but though it says they will open these files, they won't. And anyway, I had the newer version so where did it go?
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