iTunes: "Error 42408" or "Error 42404" after upgrading to iTunes 9.0.3

Products Affected

iTunes, iTunes Store

Symptoms

If your iTunes is missing resources or encountering software conflicts, error -42404 or -42408 may appear when authenticating or downloading from the iTunes Store.

Resolution

Update to the latest version of iTunes.

You can download the latest version of iTunes here.

Note: iTunes 9.2.1 is the highest iTunes version available for Mac OS X v10.4. iTunes 10.6.3 is the highest iTunes version available for Mac OS X v10.5.

This document will be updated as more information becomes available.
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