Aperture have 3.0, but cant upgrade. It says that I have to have 3,0 (but that is what I have)
If you've moved or renamed the application, put it back.
Aperture needs to be called simply "Aperture", not "Aperture 3.0" or something else, and it needs to be installed in the "Applications" folder on your system volume, not in any "Applications" folder in your home folder.
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