My MacBook Pro is now using Mac OS X 10.5.5 and Safari 3.2, but i need Safari 3.1 to do my work. So i uninstalled the Safari 3.2 and then download and try to install the 3.1. But the install wizard told me that "You cannot install Safari on this volume. This update requires Mac OS X 10.5.2 or newer" while my system is 10.5.5. Does any one happen to know why? Or anyone can tell me how to do this downgrade work? Thank you all.