Take a look at the "getting started" videos to help you get going with Robot Virtual Worlds:
ROBOTC 3.0 introduces a new and improved way of managing your ROBOTC software, designed to simplify the process of keeping all of your software up-to-date while minimizing the number of downloads and installations you must perform!
Once you have downloaded and installed any version of ROBOTC 3.x, you have everything you need (NXT and Cortex drivers excluded). No Additional downloads of ROBOTC software are required; in fact, don't try to download and install additional versions.
There have been reports of issues with with DirectX when the NetSupport software is installed which may cause Robot Virtual Worlds to not run properly. Please see this Technical Document from NetSupport for the solution »
ROBOTC 3.x includes a License Manager which takes care of all licenses for all ROBOTC products.
How to de-activate a license
ROBOTC is a Windows-only software, but it can be installed onto a MAC using Windows virtualization software.