The reason you are seeing the 1316 error is because ROBOTC is already installed on the computer; all you need to do is activate it. To activate a different version of ROBOTC (with ROBOTC already installed on a computer), all you need to do is navigate to the 'Help -> Manage Licenses -> Add License' menu option, select the correct platform from the drop down menu, enter your license ID and password, and click 'Activate Online'. This will activate the product on that computer and allow you to select Virtual Worlds as a compiler target.
We also have a wiki guide
specifically for activating Robot Virtual Worlds that can graphically walk you through this process.
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