Can I still download iTunes 10.6.3? 10.7 won't work with my OS X software which is still 10.5.8.

I can't afford to upgrade my Macbook software at this time but I did the recent iPod Touch upgrade yesterday and now it won't connect to iTunes which is 10.6.1, I downloaded iTunes 10.7 but it won't configure with my Macbook and now I can't sync my iPod with it, thus now I'm not able to add music.