iMac not freeing seat

I needed a file from unused DT2. I currently use DT 3. Support told me I could use the DT3 license to open DT2 which I did. Now I am trying to get DT3 to recognise the seat. I have removed the DT2 license but it will not allow me to register DT3 that says the computer is already using the seat. Please someone help.

You should continue the discussion in your support ticket.

Oops! Sorry

No worries.