I have many session files that have Waves vst3 plugins and now they don’t seem to be working. Please help me! 
You haven’t by any chance moved your plugins from their initial install location??
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Yup, that was the problem! I changed the path to C:\Program Files (x86)\Waves\WaveShells V12 as it was previously C:\Program Files (x86)\Waves… Now all is good 
Thanks!
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Hi @a.timbadia,
Glad to hear the issue was solved.
I do want to emphasize that the Wave’s main folder (ie C:\Program Files (x86)\Waves) or any of its subfolders, should not be scanned directly.
Instead, we place the proper WaveShell file in all of the plug-ins default folders (ie VST, VST3, AAX, etc).
As we Officially Support REAPER with our VST3 plug-ins, please refer to this link and follow the steps to properly scan REAPER for VST3 plug-ins.
In case there are any further issues, I suggest contacting our Tech Support team to advise according to your setup.
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Glad to hear you resolved this issue relatively painlessly.