Why would you need another way of download? There's nothing wrong with the Hulu download feature. There's a UI for it and everything works fine. It's just not an automated process because you need to feed it the right links which you need to (easily) search for. I'm currently using it with no problems at all. Once you get used to the process of download, it's operating very smoothly.

If those seasons of pokemon are on Hulu, you can download them.

Update regarding Amazon: It seems that in the past week or so, Amazon has made a change to their system a bit and this tool seems to be blocked from easily grabbing the links. However, samsepiol here wrote a little workaround guide for it.
With this news, Amazon no longer works as easily as before so if you're interested in this tool, be sure that you are up for some more work to download from amazon as the workaround requires additional software.
If you buy the tool from me, I can't provide you with the amazon workaround as I don't have (and haven't asked for) permission from samsepiol to give it away.