Much thanks to AnatomicWax!
Just reposting here:
- Mount the Xcode 3.2.6 DMG
- Open Terminal
- Enter the command: export COMMAND_LINE_INSTALL=1
- Enter the command: open “/Volumes/Xcode and iOS SDK/Xcode and iOS SDK.mpkg”
And on a related note, when I screwed up experimenting with Xcode3 and 4 removing them became an issue: This mac developer tip worked like a charm though:
sudo <Xcode>/Library/uninstall-devtools --mode=all