Conflicting versions are the #1 cause of WaveShell errors.
You can install V11 plugins directly through the current version of Waves Central, which supports legacy versions back to V11 . How to Install and Activate Waves V11 | Support waveshell1vst3 110x64 download install
If you downloaded a standalone .vst3 file from a third-party site and are getting errors, it is likely mismatched with your installed Waves software. You must match the with the Waves Application version installed via Waves Central. Conflicting versions are the #1 cause of WaveShell errors
Waves – CLA‑76 (Stereo) – VST3 Waves – H‑Delay (Stereo) – VST3 waveshell1vst3 110x64 download install