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The secret is the ei.cfg file located in the Sources directory on the installation DVD. The same is true for 64-bit installation media. If you have a 32-bit Windows 7 install DVD you can install any 32-bit edition from it. This works on all editions of Windows 7 including Starter, Home Basic, Home Premium, Professional, Enterprise and Ultimate. Do you have a license for Windows 7 Ultimate but only have the Windows 7 Home Premium install media? Do you want to try a different edition of Windows 7 for 30 days without having to buy it first? With a simple trick you can enable a hidden menu that allow you to install any edition of Windows 7 from any Windows 7 installation media.
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