Install Xcode in OS X Tiger 10.4.11
I had more success with downloading it from developer.apple.com directly


Point Safari to http://developer.apple.com/
Click on Mac Dev Center (on the left, in the OS X Mavericks box
Sign in (or create a free account if you don't have one yet)
In the "Additional Downloads" section at the bottom, click on "View all downloads"
Deselect all categories besides "Developer Tools"
Jump to about page 10 (of 11), the package is from Nov 2, 2007
Click on "Xcode 2.5 Developer Tools"