I few months back I I was having trouble with Opus working in Sonar. I finally have it working. thanks to Michael from E.W. Here is the procedure that helped me.
Update for Case 131265 - "Opus"
Hey Tom,
I'm not seeing we have any other e-mail from you since 2014. However, if the standalone version of Opus will not open, the plugin definitely won't either. Also, I do see you have some old blue iLok 1 keys, but you have nothing on them - Opus and the latest play are both incompatibl