Bought 3.0 but it will not let me upgrade to 3.1

I purchased 3.0 after the trial period. I received the serial number and pasted it in. I downloaded 3.1 but I get the message "Aperture 3.0 or later is required to install this update." What do I do?

If you'd searched for the error message in this forum, you'd likely have gotten your answer much faster. But what many of us have found to work in this situation is to delete /Library/Preferences/com.apple.AECT.plist and try again.

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