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..