$\color{red}{\mathsf{UPDATE}}$: See the installation tutorial published by Li Aling in the Knowing column All about TeXnique
关于 TeX Live：http://tug.org/texlive
Uninstall old versions of TeX Live
See https://tex.stackexchange.com/questions/185520/how-uninstall-texlive-2013-under-windows-8
installation method
- Installing TeX Live over the Internet
- Downloading one huge ISO file