Dear Braden
Thanks for providing the answer to this person's question above. This answer is however completely in sufficient.
Reading the community forum it appears that this problem has existed for years with out being properly addressed.
The downloading of apps and content may be one question where the resume download button works but what about the resuming of software updates to itunes and iPhones etc?
I am constantly struggling with this error. I do not have fixed line broadband. I am in a rural location and only have 3G broadband. It works perfectly fine but when a download drops out (often right at the very end) it will mean I am wasting many gig's of data for an item which I can't retrieve unless I redownload using this expensive 3G connection with limit download capcity.
For example my plan allows me 4.5 GB per month. I attempted to download iOS 7.0.3 update twice yesterday and I wasted almost 2GB trying to get a 1.19 GB update. I have given up because I only have 2GB for browsing left for the month and I CANNOT RESUME DOWNLOAD of this item.