I don't think it will work.
I have NowTV on my iPhone and iPad and works from their App on both devices. But they don't allow you to cast or mirror to your TV. I have an AppleTV box and NowTV have an App for that, which allows me to watch on my TV without the NowTV box.
It might work if you hard wire your PC to your TV via a long HDMI cable, assuming your PC has an HDMI output slot, but cannot guarantee that it would.
You could buy a Chromecast which is a stick that slots into the back of your TV without having a box. There is a NowTV App for that.