How to download and setup courier
Open terminal and run command
git clone https://github.com/themisir/courier.git
git clone is used to create a copy or clone of courier repositories.
You pass git clone a repository URL. it supports a few different network protocols and corresponding URL formats.
Also you may download zip file with courier https://github.com/themisir/courier/archive/master.zip
Or simply clone courier with SSH
[email protected]:themisir/courier.git