I purchased Overloud Rematrix some time ago and when I examine the Plugin Manager it won't recognize Rematrix. When I add an audio FX it's not there under VST pugins. I've tried including it in the options menu of the plugin manager but to no avail. 
 
I have an old Sonar 7 which loads Rematrix easily. Any suggestions. Is Rematrix already included in the new Sonar Pro and if so, how do I access it?
 
Struggling to learn my new Sonar - thanks in advance

Go into Plugin Manager and do a RESET followed by a RESCAN.
 
It's important that you do both.

Hi. Have you tried to do a vst re scan (Preferences (P), File, Vst Settings)? Maybe include existing plugins. 
All the best.
BJ beat me to it