Vista is blocking programs activation

I'v downloaded a trail version of Mudbox3D (https://mudbox3d.com/index.html)
and its purchasing it. However just discovered that in the activation page
it doesn't provide my request ID, it says request ID cannot be found. I've
ask mudbox personelle but they dont' seem knowing how to solve it. Its like
vista is blocking my MAC address so the program cannot get a request ID out
for me to register. any thoughts?