I need to obtain Microsoft SQL Server 2005 Service Pack 2 as part of a rollback plan for an upgrade to SP3. All links on the Microsoft website seem to be broken. This will be installed on a very safety sensitive system and I would prefer to obtain the installer from the official Microsoft website. I am able to obtain a download link on MSDN, but it says "No product key is required" so I'm assuming it wont even give me an option to enter a license key when I install it.
Where is the safest place to obtain a Microsoft SQL Server 2005 SP2 installer (iso or exe)?