It runs on any server that has PHP and MySql. Even your most basic shared server will work. It's delivered as a zip. And the source is technically 'open' mean

It runs on any server that has PHP and MySql. Even your most basic shared server will work. It's delivered as a zip. And the source is technically 'open' meaning you can modify the source code when you purchase it, but it's not free, and access to the source requires buying a license, and even then you're limited to the terms of the license. The biggest term that's different from most open source software is that you can't redistribute it.