You have the option to just dowload OD thru the link in the email after you've bought it,you also have the other option of using Stardock Central,which most of us use i would assume,it just makes it easier to update any bought software,you'll find OD listed in the "misc" column,Stardock Central (SDC for short)is a download & packaging app for all stardock products,it also installs them & can create backups of the older releases before you update to the newer version.