CAUTION .. I downloaded the demo for Mac and actually enjoyed the instrument - somewhat quirky but very useable, and plenty of fx / shaping options.
Then the 3 day demo expired so I bought it. Impossible to install. The validation system takes place through a 3rd party website which will not recognise the order number which I have on the receipt, and absolutely no reply from Sonivox "support" .. I basically paid the money and have no product.
I will update this message if a resolution comes, but in the meantime, I recommend buyers to shop elsewhere.
I have been a customer of Sonivox for many years and use Mellotron plug in in most of my music, recently after formatting I have been unable to re-activate it and emails to sonivox have met with silence. It would appear that the plugin is no longer available and also not supported.