(The author of the book wrote some -very- fine others...) Anyhow, I'm on for a few minutes, no more than that, for health reasons- should be fine soon. The warning about QuickTime is, based on what very little I know, very sensible- I can't install the latest Quicktime myself since it requires OS 10.3.9. Installing OS 10.4 (10.3.9 seems to be quite obsolete) requires hardware installation as expensive as getting 10.4 itself (so, at a guess, a $200+ expense instead of a $120 one), so- maybe not so much a can't as a... maybe wait until OS 10.5 comes out and see how much that costs.
,... so when using this URL or similar ones myself I may very well just turn quicktime off (Mac System Preferences). For those not in my weird situation I advise installing the latest QT. (On the QT.)