Activate the plugin and follow the on-screen instructions under the Code menu.
Gitium does its best not to version your WordPress core, neither your /wp-content/uploads folder.
Gitium requires git command line tool with a minimum version of 1.7 installed on the server and the proc_open PHP function enabled.
gitium.ziparchive into the
Alternatively, go into your WordPress dashboard and click on Plugins -> AddPlugin and search for gitium. Then, click on Install and, after that, on Activate Now.