Updating DS 2020

I'm using DS 2020 SP0 Standard for Windows and would like to update to the latest standard version.

When I check for updates in DS I get this message:

404 The page you are looking for has moved.

It looks like there is a SP3 available. How do I upgrade? and where can I find the release notes? ....and why are these things so hard to find?

Thanks,

Mark S.