These are the ROOT releases available through Fermilab upd.

v4_02_00 and corresponding releases View the release notes at cern
v4_01_04 and corresponding releases View the release notes at cern
v4_00_08 and corresponding releases View the release notes at cern
v4_00_04 and corresponding releases View the release notes at cern
v4_00_03 and corresponding releases View the release notes at cern

Go to the ROOT System page to get more information about ROOT.