How Can I download MacBook Pro version OS X Snow Lion to my 10.5.8

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Snow Leopard isn't free and isn't available as a download. You have to buy it on a DVD at the Apple Online Store > http://store.apple.com/us/product/MC573/mac-os-x-106-snow-leopard

Last year, Snow Leopard was offered for MobileMe users as a download for free, but it expired

You can't; Snow Leopard is a paid upgrade from Leopard and must be installed from a DVD, while Mountain Lion is a paid but downloadable upgrade from Snow Leopard.

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