This document provides instructions for downloading and installing ProjectLibre project management software on different operating systems. It specifies that ProjectLibre is available in .dmg, .rpm, .deb and .tar.gz formats for Macintosh, Linux and Windows respectively. It lists the minimum system requirements and correct file versions for Mac OS X 10.5.7 and newer, common Linux distributions, and Windows. Instructions are given on how to access the download page and identify the proper version for each operating system.