Received early 2009 MBP today.Has 10.8 installed, but i have no discs. What is the procedure to download 10.8 from the app store so i can register it and update, i.e., do i need to erase the disc to download. Also, i do have Leopard-Snow-L & Lion discs from previous MBP. Should i simply re install an earlier OS up to Lion and be happy with that? I'm not sure what OS early 2009 is, but it's obviously one of the above, and if it's a viable option, is it easy to do. Installing an earlier OS from 10.8. All ideas most welcome. Cheers.