Thank you my apologies it did not show the entire message before for some reason.
I have a question, if I have a software in this case Mountain Lion already installed and the app store knows its installed cause when I went to press download it said I already have it installed, it made me sign in to my apple ID and than charged me $20 even though I had it installed, shouldn't it automatically know I am running it so therefore put it in my purchased unit? In this example I did not originally download it from app store.