https://bugs.winehq.org/show_bug.cgi?id=45506
--- Comment #6 from Stan chopinbig2@gmail.com --- Waves Central uses robocopy.exe.
When the plugin installation files are just about to be installed, is when Waves Central goes into the tasklist.exe loop and I think that robocopy.exe is used for the plugin installation, so maybe some change has been added to the last few versions of wine-devel/wine-staging that stops robocopy.exe from functioning as per usual.