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Because the owner bought an SL Upgrade DVD for 25€?

You can do the same...


PS: You can't update from 10.5.8 to 10.6.2 without buying the SL Upgrade DVD, a simple download will not work.

Mac OS X numbers its family as 10, big releases as 1-6 (currently) and the smaller updates (service packs if you want) from 0 to 11.

So Mac OS X 10.5.8 belongs to family 10, release 5, update 8.
Mac OS X 10.6.2 belongs to family 10, release 6, update 2.

Updating from release to release can only be done via paying for an Upgrade or Retail version of the new release.
 
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