Trying to install downloaded Leopard on my macbook pro intel core duo

I purchased Leopard from a third party site in which it was downloaded. I'm wondering if I can install it on my Macbook Pro? Everytime I open it is says to restart in order to install but it takes me back to my desktop everytime. The only reason I'm upgrading is because I purchased some photoshop extras and in order to utilize them I need 10.5 or 10.6. I don't want to upgrade to 10.6 and I'm not quite sure if I can.

To elaborate on William's point above about the software likely being pirated: Apple never, ever sells "downloadable" versions of its software. (Updates are provided via download, but full releases are available on DVD media only.) No reseller should be offering such a download for sale.
Plus, you cannot install a Mac OS onto a hard disk that is the boot drive for that computer. So if you downloaded a version of OS 10.5 onto your Tiger (10.4) computer, you could not run the installer. A running system can't upgrade itself. That's why you must have the software on DVD and boot from that DVD. (There are other ways--sharing DVDs across a wireless network or booting from an external drive.)
For now, call Apple sales (1 800 MY APPLE in the US) and purchase a legal, on-DVD copy of OS 10.5--they are still making and selling them.

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