I no longer see files to download Microsoft SQL Server 2000 DTS Designer Components
That's quit right, even because that is out-of-support since a very long this.
DTS was supported in BIDS 2005 and BIDS 2008 was the last version. It's no longer possible to edit old DTS packages, you have to recreate them using current SSDT tool.
https://learn.microsoft.com/en-us/sql/ssdt/sql-server-data-tools?view=sql-server-ver16