Problems installing registered massive.dll into audacity

Is anyone able to tell me why when i go to install massive from the plug ins manager it comes up with a message stating masdive.dll failed to register?
Im doing everything im supposed to

Is this anyone elses experience?

Audacity does not support VSTi (VST Instruments)

Hello, I am unable to post my own question, but I have downloaded serato sampler 32 bit and I am getting the failed to register error, please help I need this plug in.

Audacity does not support VSTi (VST Instruments)