I can't found the setup.exe on the MS Exchange Server 2003 SP2 only update.exe

Hello guys,

I want to install MS Exchange Server 2003 on Windows Server 2003, but the setup file that I am downloading has no a setup.exe it only has update.exe. When I search on Google it only gives me SP1 and SP2 setup which has update.exe in the setup folder. Where do I find a setup with setup.exe?

Help me

Thank you