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No additional license required.
Each computer will generate its own unique serial number, so send us the serial number for your desktop and will will send yo a new key. We accept that most users have this configuration and will issue 2 license keys to support this.

To remind you see the license procedure here

I originally installed on my laptop, and now want to use on my desktop in the office. It installed OK , and works in the trial mode, but when I use my original license key, it rejects it saying it is invalid. D o I need to purchase an additional license? I hope not as most of my work will be on the desktop and I will use the laptop for customer presentations.