If you are a true Mac lover, you would have saved up your money to purchase the upgrade and not trust ‘what every one else is doing’.
We do not discuss any problem with a download from a place where the software is illegal.
That said, find your 10.6 install disk, plug your book into an outlet, start it up using the 10.6 install disk (insert 10.6 disk, restart holding down the C key), then install 10.6.