Latest Waves version (9.91) seems to support Sonar Platinum (VST3).
https://www.waves.com/sup...-specs/supported-hosts But I'm sure that Waves will stop supporting Sonar from now on.
I have 40-50 Waves plugins, and I will keep on updating them and my OS. Also decided not to continue working on Sonar anymore and why should I - it's a dead platform! I have projects to finish and I can't take that risk that one day some 3rd party plugins start to glitch.
The most stupidest advice what I've seen here: take your computer off the internet to prevent OS and software updating. No. Just no. It's better to move on, forget Sonar and continue working on a new DAW.