No, DON'T use those download accellerators. All they do is make multiple connections to get the same file. Sure, YOU might get faster downloads... or not... but either way you slow it down for the rest of us. In addition, those accellerators really only work well if you are dowloading from a place that has multiple download sites. In a case like this with a single location, it probably won't speed you up at all.
Also many times servers will be set up to only allow a single connection to stop just this sort of bandwidth use.
Oh, and yeah, they are often full of spyware.