1. After installing the 90-day free trial version, go to "Add or Remove Programs," find "Microsoft Visual Studio Team System 2008 Team Suite-ENU," and click "Change/Remove." In the interface, there will be a place to enter a product key. Simply input the official license key: **PYHYP-WXB3B-B2CCM-V9DX9-VDY8T**.
2. Replace the original serial number in the line under [Product Key] in the setup.sdb file located in the setup folder of the downloaded ISO image file with a valid official serial number. For example: