When I bought the wife her 27" iMac it was when Lion first came out. While the wife and I have downloaded apps to the iPad's and iPhone's that were free, we've never downloaded anything that cost money. If I pay for and download Mountain Lion (or Maverick) is there an option to not immediately install it? Is the download stored in the Downloads folder as a DMG that I can execute later? Sorry for the newbie question, but there you have it.