Upgrade Photoshop CS3 to CS4: preparations?

Hi,
I just purchased Photoshop CS4 upgrade. I have CS3 installed. Do I have to uninstall Photoshop CS3 before I can install CS4 or can I just install CS4 over CS3? Since this is an upgrade version, does it require CS3 to be present?
Thanks in advance!

The upgrade does require either CS3 to be installed or the serial number from CS3.
You can install both CS3 and Cs4 on the same system. They are wholly independent.
Whether or not you uninstall CS3 is your choice. But if you do, be certain to save any custom actions, brushes, styles, etc., first.

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