Numark Mixtrack 3 is bundled with VirtualDJ LE (Limited Edition). The Limited Edition has no time limit, and Mixtrack 3 will fully control VirtualDJ.
However some features will not be available. See details here http://www.virtualdj.com/wiki/What%20is%20the%20difference%20between%20VirtualDJ%20LE%20and%20other%20VirtualDJ%20Licenses.html
If you don’t own a Pro Infinity, a Plus or a Pro Subscription license, use the following link to download and install VirtualDJ 8 LE, by entering the VirtualDJ LE Keycode that came with your unit.
VirtualDJ 8 LE download link: http://virtualdj.com/le
Follow setup instructions as provided here.. http://www.virtualdj.com/wiki/VirtualDJ%20LE%20Install%20Guide.html