From the main FAQ: "9. How many computers can I use VEGAS Pro on? You can use VEGAS Pro (14.0 and later) simultaneously on 2 devices. There are 2 ways to deactivate a device so you can activate a different one:
Visit your MAGIX account > My Products > Show More Details > Deactivate. This option can be used only once a month.
From the VEGAS Pro Help menu choose Deactivate the Software on this PC. This option can be used as often as you wish. An internet connection is required."
Maybe a server problem? But check your activations to see if there are any free slots. In case there are "double" activations try deactivating one.
I purchased Vegas Pro 16 DVD, registered it successfully, then installed it on my laptop first to ensure no tech issues would emerge. Then installed on my desktop workstation successfully When I launch Vegas, it asks for activation while showing both GREEN check marks. But activation abends with error related to internet connectivity issue. With strong signal, firewalls disabled, Norton360 disabled, etc -- activation continues sending same error msg.
So I appealed to Magix online activation proc but the "Computer ID" repeatedly fails after trying a dozen numbers. Send work ticket to Magix and they claim a manual or offline activation is not available. So what to do?