It sounds like your version of the Waves installer (WOLI.exe) is now outdated, and you may have tried installing these newer sub-version plug-ins with the old installer. You will need to download the latest WOLI.exe from Waves, and then re-install
ALL of your Waves plug-ins.
WARNING! Go to each Waves plug-in on each session you wish to keep Waves settings and save them individually before doing this (Saving ProChannel or FX settings in Sonar WILL NOT WORK!):
Close Sonar, btw before doing this.
1) Download the latest Waves WOLI.exe or offline installer from your Waves account.
2) Install the plug-ins as normal, BUT, if you're running 64-Bit Sonar, choose a hidden directory for where the installer wants to place the
32-Bit versions of the plug-ins. Doing this will significantly reduce Sonar crashes with Waves plug-ins.
3) Finish the Install.
4) Start Sonar.
5) Reset the plug-ins per Cakewalk instructions (WARNING: you likely will lose all your previously saved Waves settings unless you've saved them individually in each session.)
6) Rescan plug-ins or restart Sonar.
NOTE: The reason you will lose Waves settings in a session is because Sonar does not understand the minor version update from Waves (from 9.0 to 9.2, for example). It sees them as a whole new set of plug-ins. Therefore, Sonar will tell you it can't find these plug-ins. You will need to delete and replace the existing Waves plug-ins with the same ones on each session (whether in the FX bin or ProChannel FX), then load your saved settings for them.
Trust me, I wish this wasn't the case, and for me it literally destroyed hundreds of old sessions forever, but it is something either Waves, Cakewalk, or both didn't predict. Being able to install the old Waves plug-ins would help me recover those older sessions, but Waves licensing doesn't allow this, unfortunately. Fail.