There are 100 or so RealTracks, but each one does not have a separate installer file.

Here are the files I downloaded and installed to update my BIAB 2009 to BB2009.5 with all the newly introduced RealTracks and RealDrums files:

bb2009update_build284.exe -- 20.5mb
realdrums1-20_update_aug12-2009.exe -- 30.2mb
realdrums21-22.exe -- 324mb
realdrums23-24.exe -- 234mb
realdrums25-26.exe -- 184mb
realtracks1-39_update_aug12-2009.exe -- 389mb
realtracks40.exe -- 459mb
realtracks41.exe -- 892mb
realtracks42.exe -- 478mb
realtracks43.exe -- 1.03gb
realtracks44.exe -- 1.06gb
realtracks45.exe -- 702mb
realtracks46.exe -- 502mb
realtracks47.exe -- 649mb
realtracks48.exe -- 564mb
realtracks49.exe -- 354mb
realtracks50.exe -- 580mb
realtracks51.exe -- 769mb
realtracks52.exe -- 806mb
realtracks53.exe -- 1.56gb
realtracks54.exe -- 856mb
realtracks55.exe -- 840mb
realtracks56.exe -- 1.22gb
realtracks57.exe -- 750mb
realtracks58.exe -- 721mb
realtracks59.exe -- 752mb
realtracks60.exe -- 708mb
realtracks61.exe -- 931mb
realtracks62.exe -- 980mb
realtracks63.exe -- 483mb
realtracks64.exe -- 950mb
realtracks65.exe -- 910mb
realtracks66.exe -- 633mb

HTH,

--Mac