With OS upgrade from 10.3.9 to 10.4.6 - have lost Music library; keeps telling me that I must d/l 10.4.7

Have moved up from a G3 / 450MHz / B+W to a G4 Quicksilver with Dual 1 GHz processors. Had OS X 10.3.9 and things worked well. The Quicksilver closely approximated the G3. Decided to move up to Tiger. Obtained 10.4.6; upgrade worked well except for the fact that when I click the iTunes icon for my "music library"… I get a dialog box telling me that I must upgrade to 10.4.7;

PERHAPS I have jumped too far up the ladder??! Couldn't find a 10.4.2(?) install disc… and forget about downloading what I need, because I'm still on a dial-up. It would take a 'month-of-Sundays' and the there would be an involuntary modem hang-up along the way.

WILL be getting HSI (High Speed Internet) in the near future, because I also have a 27" iMac. At that point the Quicksilver will become a server.