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I need to re-install Autocad 2009 on my machine only when I come to actvate it I get a invalid serial number message, can anyone shed any light on this? do I need a new serial number and if so how do i get one?
Same as other items in your house, if they don't work, call the people who sold it to you, then the manufacturer.
Chances are that this serial number has been upgraded or crossgraded under Subscription or other means. You will need to contact your reseller. If your seat has been upgraded to a later version, you will need to have an active Subscription contract to use previous versions, as the lease on your old license has expired when upgraded.