I use a download manager on non broadband PCs, not because of any supposed speed increase but because as you correctly state the two hour limit kills downloads via the browser. A download manager means you can stop, store and resume later should you wish.
That said I can't stand Real products, try Download Express simple small and does the job.
Real player, I'm sure,is not a download manager, it's a media player so would not have any effect on downloads. But as Belatucadrus quite rightly state a download manager such as he suggest might be useful.
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