My unity 3.0 doesn't seem to install!

I downloaded the unity 3.0 like 30 minutes ago on my powermac g5 Leopard and when i clicked on the mpkg file it asked me first if i wanted to install i said yes , then it said The specified message for index 17 could not be found.
Could anyone help me with this problem please?
I would really appreciate any help :smile:

Thank you. Jeffry

unity 3 does no longer support ppc for the editor, only intel based macs with 10.5 or higher