After having the same issue, I wanted to share my “solution”.
So, I bought some Waves Plugins, and Cubase was blacklisting them everytime. At first, I thought it was a 32bits version that was not working, but it wasn’t, and even my 64bits were blacklisted.
Then I saw that they were all VST 2 plugs, but after hours of trying to find the solution, I asked Waves to help me.
Here’s their answer :
Once the license is sent choose: Install->Uninstall Products (at the top).
Choose all the products click ‘Uninstall’.
Once uninstall is finished - quit Central.
Uninstall Central :
Uninstall Waves Central itself using Control Panel->Programs and Features
Remove Various files:
Click on Winkey+R and enter the text %appdata% - click Enter. Delete the Waves folder inside ‘Roaming’.
Click on Winkey+R and enter the text %programdata% - click Enter. Delete the ‘Waves Audio’ folder.
Conduct a file search on your system for the term :“WaveShell” and delete any “WaveShell” file that you find.
Download and install the latest Waves Central for Windows
Run Waves Central application and log-in.
Click on Install at the top tab, then select Install
Click Online (on left pane)
Select all your products (in the middle pane)
Click Install on (the bottom right)
So, I think that the real thing here is to clean all your system in order to have a real fresh install. Follow every little step + CCleaner if needed.
It worked for me, I hope it’ll for you, people of the future.