just updated and: aperture can't update library

The library in “/Users/name/Pictures/Aperture Library.aplibrary” cannot be upgraded

Is that the full error message you get? Are there any additional messages in the Console window? Any crash logs?

Backup your Aperture 2 library, if you have not done so and rename it from the default name, so that Aperture 3 will not overwrite it, by accidentally creating a new library.

Your Aperture 2 library may have a corruption. To repair this, try to repair the permissions and rebuild the library with the "Aperture library First Aid Tools". This would best be done with Aperture 2, if you have saved your Aperture 2 application, see the "Release Notes" (at the bottom of the page, additional information).

If you no longer have Aperture 2, try the repair with Aperture 3:

Hold down the option-command-key combination⌥⌘, while you double click your Aperture library.

Then select "repair permissions" from the First Aid panel, followed by a "Rebuild Library".

Regards

Léonie

What does your Aperture application window now look like? Can you post a screenshot, please?