The user interface i.e. the plugin window is empty.

If your DAW software finds the plugin and is able to load it, but the plugin window is empty and has no user interface, the following solution will most likely work. Download and install the following special edited version of the plugin, which uses an alternative system to render the UI.

Download VST3 64 bit
Download VST3 32 bit

Download VST2 64 bit
Download VST2 32 bit