Upgrade a license - How install Video Chat ?

[FreeArrow]

Hello,
We had a Premium license and we upgraded to have Video Chat.
Do I have to completely reinstall the product?
We have followed the update procedure, but the camera does not appear in the Chat window.
We must have made a mistake, but we don't know where....
Can you help us?
Do I have to completely reinstall the product?
Thank you in advance for your advice.