I currently have a late 2008 Macbook Pro running Mavericks that I use as a spare computer. I was thinking about upgrading to an SSD. If I put a new drive in, can I install Mavericks directly onto the drive (with a bootable USB flash drive) or do I have to install Snow Leopard again and then upgrade through the App Store? I lost my SL disks, so I am looking for an alternative.