Hi all, I'm considering upgrading to Mavericks soon. I'm running Snow Leopard 10.6.8 as 32-bit on a late 2010 15" Macbook Pro, with 4GB RAM. I'm curious - will I have to re-install Snow Leopard on the machine as 64-bit for Mavericks to install properly, or will Mavericks install itself as 64-bit on the machine straight from the App Store download? And is it recommended to install Mavericks from a fresh install of 10.6 or is everything OK without a fresh install? Thanks in advance!