Installation instructions, current features (and donation link) can be found there:
http://www.azslow.com/index.php/board,13.0.html
Sonar X1-Platinum 2017: everything supported by the converter is converted
Sonar 7-8,5: almost everything supported is converted
Sonar 5 and older: mixing (parameters, buses, sends) and FXes/SoftSynth are NOT converted. Re-saving using newer Sonar, in case you have such possibility, will greatly improve the conversion quality.
That is an alpha version, but everything planned is converted. Please do not hesitate to ask for additional features (if they can really help you... just because something is in Sonar does not mean it make sense convert it)