The Zero Install Injector makes it easy for users to install software without needing root privileges. It takes the URL of a program and runs it . Any dependencies of the program are fetched in the same way. The user controls which version of the program and its dependencies to use. Zero Install is a decentralized installation system , loosely-coupled , and has an emphasis on security . Each version of each program is stored in its own sub-directory within the Zero Install cache and no code from the package is run during install or uninstall. The system can automatically check for updates when software is run.