If you do an offline activation, actually I think that this is the case:
1. Go to
http://activate.mixvibes.com.
2. Choose your language.
3. Choose activation.
4. Fill the form with your personal information.
5. Fill your serial number and activation request number (you see it when you click on Offline activation in Vfx).
6. Get your activation key.
7. Back to MixVibes Vfx.
8. Enter your activation code.
9. That’s All!