C:\Program Files\Common Files\Avid\Audio\Plug-Ins (for AAX versions).
DeeCrystal Crystalizer / VST & AU & AAX plug-in - dotec-audio deecrystal.dll
Probable root causes
The deecrystal.dll file is specifically the version of the plugin. To install or fix issues with it, the file should be placed in your system's shared plugin folders: deecrystal.dll
DeeCrystal Crystalizer / VST & AU & AAX plug-in - dotec-audio deecrystal.dll