I looked at https://github.com/andymatuschak/Sparkle/blob/master/Sample%20Appcast.xml and looks like we can have more than one <item> tag.
I couldnt find any documentation on what actually happens when we do this? Can we specifically say that for this installed version, use this <item> tag and so on...
Um, that is what you do to add another update. One could be for version 1.0, and the next could be for version 1.1, etc.