I have found out that my problem is actually that my serial numbers were used in a previous installation (actually, a previous installation attempt). I had made an unsuccessful attempt to install SW on my previous laptop where I had limited space. That installation was aborted. I soon purchased a new laptop and this is the one I'm getting the install errors. The old machine has been wiped clean and sold so I don't have any way to deauthorize my serial numbers on it. Is there a way to do that through Dassault or EAA?