We recommend you read the Release Notes and Readme before installing SQL Server Enterprise Evaluation.
SQL Server 2008 Enterprise Evaluation is available as an image file that contains X86, X64 and IA64 installable versions. You can use this image to burn your own DVD.
Step 1: Click the following link to download the file.
Step 2: Using your DVD-burning software, select the options to burn a DVD from an .ISO image. When you are prompted for a file to use, select the image file that you downloaded. After burning the DVD, locate and double-click Setup.exe on the DVD to begin the installation.
Step 3: Follow the installation instructions provided in the Readme.
You may also download a self-extracting executable (EXE) that is specific for X86, X64 or IA64. These executables do not support X86 installations on 64-bit versions of Windows. Use the DVD image for X86 installations on 64-bit versions of Windows (IA64 is not supported).
Self-extracting executables: