Without an exception from Autodesk, you cannot. Subscription support for 2008 has long expired and since the lease on the 2008 license has already been upgraded to 2010, as you say, then the license for 2008 is no longer valid per the EULA. Your best bet will be to contact your VAR or Autodesk to work out an exception for 2008. However, there is no guarantee for this. Good luck!
I will take up the issue of 2008 version separately but I still have the 2009 version to transfer to new PC. I just want to know what steps I have to take to do this properly. Regards, John. John McGetrick Denis O'Leary & Partners Phone: 01 2883420 (Office); 01 4555 526 (Home office) Mobile: 087 205 0418 e-mail: email@example.com