You can also use Project Pro for Office as a standalone desktop application, as well as to connect to an on-premises installation of Project Server or the upcoming Project Server The application runs as a click-to-run application, which means it can easily be installed from any Windows-based machine with Internet access. It also gives you the added benefit of allowing installation of the software on up to five devices. By default, Office updates are also downloaded and installed so the product is always up to date. Several of our clients have had some confusion on how to obtain the latest version of Project with their existing deployment of Project Online.
The limitation is the trial period of days. However, by the time it expires, you would have mastered how the software works. But the software does not work on Mac os.