I've just installed Zorin 15.3 using the lite installer on a MBP 2009 I inherited from my mother. I have to say, its taken me a few days and several tries and hiccups to a) find this really impressive OS and b) get it to install (I needed a RAM upgrade as the 2Gb seemed to cause freezes during installation).
However the final result looks great. Zorin is excellent work, and now I've brought this old machine back to life its very pleasing as I can keep it on my workbench for electronic music uses.
Thanks for the great work to all at Zorin.