Mac OSX latest Version & Xcode

The other day i downloaded XCode from Apple site to have some experience of Apple development . And also the iPhone Development kit . After i downloaded the software it asked me to update my OS to latest version from Software Update tool before i can install the downloaded Software kit . It was irritating to know that . I dont find any reason why i should be having latest OS X version . Though I have 10.5.3 version of OS X . Latest one is 10.5.4 . I did not want to update my OS version . Rather i found a cool fast trick to get the Mac OS X version to any number i wanted . Now i have Mac OS X Leopard version 10.5.5 before apple has seeded this version .
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What i did is - I modified the version number in the file SystemVersion.plist located at Leopard Installation drive>System>Library>CoreServices. Now i am able to install the Developer kit .

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So, by changing in the file .plist the numbers, in the window we will have a “latest” updated version?
I will put something like 2010.5.5
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@Vic, we wont actually have the latest updated files of course . we are just cheating the OS X
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[...] other day i downloaded Xcode and was trying to install it from Apple developer site . Seems like the installation wizard [...]
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the system does not let me save the systemversion.plist file..
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@sharon - before you can save your changes to this file you must change the permission on the file and its parent folder. To do this, use Get Info on each item and then under Sharing & Permissions changing either “everyone” to Read & Write or add yourself with Read & Write permissions. Now you can open the SystemVersion.plist file with an editor, change the version numbers contained within, and then save your changes back to the same file. Once done with the install (i.e. XCode, etc.), I would suggest change these version values back and reversing the file and folder permissions back to what they were.
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