[kijin]

You don't need to install any software to use the internet at home in Korea. You just get a modem that connects to fiber at one end and exposes an ethernet port (or wifi) at the other end. Just connect to that port and you're online immediately.

ISPs also provide TV and a bunch of other services, though, and some of them might require installing specific software in order to use on a PC. Or perhaps they hijacked an unencrypted download of someone else's software, most likely some component of the file sharing service in dispute.