After upgrading recently I got this message: "The file 'iTunes Library.itl' cannot be read because it was created by a newer version of iTunes." The music/video files are still on my MacBook Pro.  Is it because I'm still on 10.5.8?  How do I fix this?

For your reference I’m using a MacBook Pro running 10.5.8.  Several weeks ago on a Monday I received an upgrade for iTunes. When Tuesday arrived I attempted to log in so that I could download the latest freebie song(s).  I was met w/this message: “The file ‘iTunes Library.itl’ cannot be read because it was created by a newer version of iTunes.”
The music/video files are still on my Mac (I’ve verified that via Searchlight), but I’m unable to open the program.  Since I know that 10.5.8 is rapidly becoming prehistoric, could it be that the newest iTunes isn’t compatible w/this particular OS?  I’d like to switch up, but understand that the newest OS won’t work on a Mac of this vintage (6 years old).  In addition, my Adobe products (all CS2) won’t work w/anything newer than 10.5.8, so I’m reluctant to go to a newer OS (I just can’t afford the Adobe upgrade $$$ @ this point). 
Is there any way to get a download of an “old” iTunes version?  If there were, I’d simply refuse any future upgrades until my personal economy allows me to stop working as if it were 2006.  Please advise, somebody!

I don't know how you received an upgrade for iTunes.  You make it sound like it was sent to you.  At most your computer will tell you of a new version and you tell it to download it and install it.  However, a computer will not do this for a version which is incompatible.  iTunes 10.7 came out a few weeks ago but your computer would not notify you and even if it did, 10.7 would refuse to install on your computer.  So this part isn't making a lot of sense.
Two ways to get the 'newer version' message.  One is to open your library on a computer running a newer version, and then try to open it with an older version.  Usually happens when the library is on an external and used with multiple computers.  The second way is if you have multiple versions of itunes installed on your computer.
The newest (and likely the last) iTunes for OSX 10.5.8 is iTunes 10.6.3 which has been out for quite a while. 
iTunes 10.6.3.25 - http://support.apple.com/kb/DL1575

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