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Then you can't do that. What exact Mac do you have? And when did you buy it?
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Build 10k549
version 10.6.8

macbook 5,2

i bought this i think 4 years ago or less
 

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Build 10k549
version 10.6.8

macbook 5,2

In that case, you can get the Mac OS X 10.6 Snow Leopard Upgrade DVD for 29 USD and use that for a clean install* or download Lion for 29USD, but not install it and create a bootable installer of that Lion download**.

*
To create a Clean Install (formerly known as Erase & Install) of Mac OS X 10.6 Snow Leopard (the 29 USD Upgrade DVD is a fully working retail version of Mac OS X and does not need a prior installation of Mac OS X on the Mac), follow one of the following guides:
Short version: Clean Install of OS X 10.6 Snow Leopard
Long version: Mac OS X v10.6 Snow Leopard: How to Erase and Install

**
 
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