Hi, This is further to my earlier mail in this regard. I""ve upgraded to windows 8 and tried to install CADian 2008 on my new OS platform. After installation of the software, when I try to run the program, I get an error/ pop up msg which says "For doing this operation, you have to log in as Administrator" I""m already logged in as administrator and I get no options to request for request for new/ updated authorisation key etc etc please help. please let me know if you need any other details in this regard Thanks and regards, Sunaabh Sarkar