If you are looking for a "free download" of the full version of SONAR X2, it is important to understand the software's transition:

Cakewalk SONAR X2 Producer was once a flagship professional digital audio workstation (DAW) celebrated for its revolutionary and comprehensive suite of high-end production tools. While the original 2012 software is no longer sold or officially supported, its legacy lives on through modern, free alternatives from its current owner, BandLab Technologies. The Evolution: From SONAR X2 to Modern Cakewalk