I install the latest version V12 and the waves plugins are missing when I open a project. I can call them only through studioRack. Is that possible?
What Os and DAW are you using??
Hi @titosmare and Welcome to Waves Forum 
As Simon wrote - your DAW application and operating system version are required in order to provide you with further troubleshooting steps.
Also feel free to contact our Tech Support department. They will be more than happy to get you up and running with your plugins.
You can take the support of studioRack to solve this problem and upload easily.