Hi. Just bought a second hand white macbook on eBay. It comes with OS X 10.4.11 instlled, and the original discs. I need to get from this to Leopard - 10.5 Can I make this jump via download, do I have to pay? I did try looking on the apple site before posting here, but I coud only see updates to snow leopard, which I don't really need (the software I'm after requires nothing more than 10.5. Sorry if I'm being useless, but can anyone tell me how to move forward with this? Thanks.