Hi Lambada,

The Download Manager looks at the serial number you used to activate to see which pack you own (Pro, MegaPAK, UltraPlusPAK, EverythingPAK, etc), and downloads and installs whatever RealTracks and RealDrums come with that pack. Any additional add-ons you've purchased will need to be installed separately, as they aren't associated with your serial number.

Updates are installed using a different feature, "Check for updates" in the Help menu.

Thanks
Kent
PG Music