Im having a problem with downloading stuff

It could be a virus, so do a thorough scan. It could also be related to a faulty file being hosted, which since it is apparent in Sugar Rush, I doubt that. Try to use Firefox if you don't already. It sounds like the download does not complete, so does your internet randomly pause or disconnect for short periods of time? I don't know what exactly would cause it to stop halfway (although I get it rarely).