You will need UTorrent or BitTorrent to download these TV shows.

If you need to download UTorrent then click here if you would rather BitTorrent click here

A torrent is a file (usually .rar) That you will have to extract, you can use 7zip to extract rar files, 
This process if quick and simple and very secure... don't worry about that.

TBBT-The Complete 3rd season

SP-The Complete 14th season

AD-The complete 4th season

TS-The Complete 20th season