Steinberg Download Assist Not opening?

Hi Guys,

I have wasted hours tonight trying to install the Wavelab Elements 10 Trial for Mac… call me stupid, but it is not working?

Every time i click on the Steinberg Download Assist it won’t open. I have tried registering the activation code and it tells me it is not valid and it keeps looping between the website download page and the “You’re almost done” page?

Can someone please tell me what i am doing wrong? Any help would be great appreciated!