How to Upgrade Photo Booth for a Mac

Go to the official Apple Photo Booth and iChat upgrade page (see Resources).
Click the 'Download' link in the top right corner of the page to start the download. Choose a folder to save the file to, if prompted to do so.
Open the file once it finishes downloading. Depending on the computer settings, the file may open automatically.
Follow the on-screen prompts to complete the installation process.
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