I have Mac OS 10.5.8 and I would like to upgrade to 10.6 or later.

How to uograde from OS10.5.8 to 10.6 or later?

The first step in Upgrading... is to Snow Leopard = OS X 10.6.x
It is Not available as a download... It is a Paid Upgrade.
Do this first...
Check that your Mac meets the System Requirements for Snow Leopard...
Snow Leopard Tech Specs
http://support.apple.com/kb/SP575
If so... Purchase a Snow Leopard Install Disc...
http://store.apple.com/us/product/MC573Z/A/mac-os-x-106-snow-leopard
Other countries...
http://support.apple.com/kb/HE57
After the Successful Install, run Software Update to get the latest updates for Snow Leopard and iTunes.
Be sure to make a Backup of your Current System Before Upgrading...

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