Teamsite Service packs

System

Hello Everyone,
can any one tell me where i can find service packs for Teamsite 5.0.1 and Teamsite 5.5.2 Both on Win 2000. Please send me a link if they are available from support site, I actually found some on support site, but coudn't download it. I am pretty sure i don't need an Username or password for downloading them. Please help
Thank You