Is there some other reason why you think the idea I suggested is incorrect, or not worth it? Because it seems to me that claims like India "isn't a huge concern" might hold some water, but I've read of people complaining of flaky connections even in countries with better infrastructure. Does Apple really want to waste bandwidth on re-uploading data that has already been uploaded? Lion isn't the only multi-gigabyte application available for download on the Mac App Store.

I can only comment on America and Japan, but I'm fairly sure that if it were that simple to implement resumable downloads, Apple would have already done so. Who knows - maybe they already have. After all, you admitted to actually restarting the download from a different IP, which means that the issue may be something completely different.