Intel Pentium 4, Intel Centrino, Intel Xeon, or Intel Core Duo (or compatible) processor. The Mac version of the download is 759.57 MB, the Windows version is 463.59 MB. Photoshop CS3 Extended includes all of the features in Photoshop CS3 plus specialized features for editing 3D and motion-based content and for performing image analysis. Here is the direct link to the Adobe Photoshop CS3 Extended 30 Day Trial. If you evaluate one trial product and then buy another, you need to uninstall the original trial product before installing the purchased product. To simplify your trial conversion, we recommend that you try the product you intend to buy. Our new trial process enables you to evaluate a product and then convert the installed trial to an unrestricted version by purchasing it and entering a serial number. When the trial expires, you must purchase the software to continue using it. 'There are two ways to get a trial: by downloading a trial or by ordering a trial DVD set. 'To evaluate Adobe's creative software, we are offering fully functional 30-day trials of all Adobe Creative Suite 3 products and editions.