Fear not, Leopard users, Apple is still watching out for you. QuickTime 7.7 for Mac OS X 10.5 Leopard closes quite a number of security holes. As is common, we have no sense of how worrying these vulnerabilities really are, but it’s probably worth updating if you use QuickTime in Leopard. And if you’re running Snow Leopard or Lion, move along, there’s nothing to see here. (Free, 68.85 MB)
Turn Off Filename Extension Warning
In Leopard, Apple fixed an annoying aspect of working with the Finder in Tiger. Previously, if you changed a file's extension, the Finder prompted for confirmation. But since no one has ever accidentally changed a filename extension, Apple thankfully added an option to turn that warning off in the Leopard Finder's preferences. Choose Finder > Preferences, and in the Advanced screen, deselect Show Warning Before Changing an Extension.
QuickTime 7.7 (Leopard-only)
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I downloaded from the link you provided. When trying to install, when I got to "Destination" a got a 'block' saying that I need to use the software update.
Okay, so I launched QT 7.6.6 hit the software update and it said I was up-to-date.
Okay, so I App Zapped it. Tried the QT 7.7 installer still at square one.
I keep playing around, but if anyone has any suggestions...mucho appreciato :)
using Mac OS X 10.6.8
http://www.apple.com/quicktime/download/ still downloads the old 7.6.9 dmg. File size matches my existing 7.6.9 file, so it's not just a graphics glitch.
Hopefully, Apple's on top of this.
Matt described it the best: "Apple, whose attitude towards backwards compatibility ranges from somewhat cavalier to downright heartless."