I am guessing that Sage will attempt to close down the old knowledgebase at some point. You will find with Atlas that most (if not all) the main pages require a login to access -- however many links to downloads and other material that are within the KB article do NOT require a login.
Therefore you can keep a list of those handy links -- download of v4.5, tax tables, product updates .... those can be useful when needing to share a download to a customer IT department who does not have a week to figure out how to log into Atlas.