I have recently got a new macbook - in a hurry rather than transfer the autocad lt 2013 liscence from my old macbook I downloaded the 2015 30 day trial. Now I am trying to install 2013 and transfer the liscence I am having some major problems. I got rid of 2015 version and now when I try and download the 2013 version so I can start the transfer I get the error: "The updater has detected that you have an active AutoCAD LT instance running on the this computer by user xxxxxx. Please close all active instances of AutoCAD LT and Retry." I cannot find anything else on the machine so am unsure what to do - any help would be much appreciated!!!