In this section, we will introduce the installation methods through cmd line or package manager of TeX Live 2018.

Cmd Line Method

Run command line as administrator, the installation commands is

tlmgr option repository
tlmgr install elegantpaper

If you want to update or uninstall package, you can use

tlmgr update elegantpaper
tlmgr uninstall elegantpaper 

Package Mananger Method

Search tlmgr in windows, and open TeX Live Manager,

click tlmgr and choose Load standard net repository:

type the package name in the blank, and select the package you want to install/update/uninstall and click the action you wish.