Going back to Mac OS X v10.5

I upgraded my Mac from Leopard (10.5.6) to Snow Leopard (10.6.3).  I wish now that I hadn't, because my editing software (I'm in video production) also had to be upgraded to work with the new 10.6.3.  But I'm on an extremely tight schedule--things aren't working like they did before, I don't have time to get things squared away, so I would like to go back to Leopard 10.5.6.
I downloaded it, but when I attempted to install it on the Mac, it said my drive didn't meet the requirements for it.  I presume because I now have 10.6 on there.  How can I go back?  I'm in panic mode and need to get this remedied quickly.  Any advice?

Also, just to clarify, I have the Snow Leopard 10.6.3 on DVD.  I installed it last week.  What I downloaded today was Leopard 10.5.6.  I had hoped to replace Snow Leopard with it, but like I said, when I attempted to, a message said my hardrive did not meet the requirements.  And I presume it's because it has been upgraded to 10.6.  But from all I read today, it sounds like I've got to get Leopard 10.5.6 on a DVD in order for this to work.  That way I can go through Disk Utilities and erase my current drive.  After of course, I've backed it up.  thanks again.

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