I have 2005LT on my computer. A couple of months ago a motherboard died-out on me and I had it replaced. Now I got a new computer and wanted to transfer license to the new one. I exported the plu file to USB stick and tried to import it on the new computer - and it said it is not a valid license file. Now I have to computers with no AutoCAD. Is the motherboard change the issue? Can it be helped?