Sounds like these photo's are already on your computer and would not need to be downloaded again.
Unless you are using the term "Download" to mean something other than bring files down from the internet onto your computer.
What are you trying to do with these edited photo's?
Does anyone know why I wouldn't be able to download photos onto the internet that weren't directly imported into iphoto? For example: I have had photos in iphoto or my photobooth that I have put into photoshop and edited and then saved again into iphoto or my desk top and I wasn't able to dowload them. What is going on?