Zero Install allows installing software easily and without the need for root privileges. It takes the URL of a program and chooses suitable versions of the program and all of its dependencies (also identified by URLs) according to the user's policy settings (eg. "stable", "testing", "minimal network use", etc). The chosen versions are downloaded and cached and the program is run, using environment variables to let it find the components. Changes: Support for MacPorts was added, so that packages installed this way can be used as dependencies. A number of minor bugs were fixed, including support for detecting multiple versions of a native package (e.g. for multi-arch systems) and batching PackageKit requests to avoid the transaction size limit.