This Service Pack 1 for MDAC 2.8 installs the same main Data Access components as Microsoft SQL Server, the ODBC controller. However, this pack doesn't include Microsoft Jet, nor the ODBC controller for Visual FoxPro.
The most recent versions of MDAC were integrated into Microsoft's operating system and Internet Explorer. After MDAC 2.8 SP1 they stopped offering the framework as a redistributable pack. Even though MDAC has had various security vulnerabilities over the years, these have been fixed with the many updates.
If you want to get all the updates for MDAC 2.8, you have to download MDAC 2.8 SP1, and you'll soon see how things improve.