Can't really help with downloading certain TV shows, but you might try wathing Japanese TV live on the Internet. There are some programs like:
Keyhole TV
But it's not very good. All popular TV programs are available, but video and audio quality sucks there, it's like watching videos on a cellphone.
Also there is
Livestation
The video quality is alot better and audio is excelent. And you'll find more Japanese TV programs there.
Both programs are for free, but you need to have a good Internet speed if you want to watch live Japanese TV on the Internet.