Dear Sirs! We have purchased 2 pcs. of CADian2012 in february this year, after installation we have registered them both, and have used them for 9,5 month without problems until now. From today, we can not work with one of them (Serial nr.I14-40NH-QTXY065G) because it""s starting with "Authority registration for CADian" window, asking for registration. That computer has no internet connection, so we chose manual registration and click next. Then in the next step we get an interim code: "KDCGIZC2G579CCCIPHPE" beeing asked to enter the Authorization Code. If we enter the Auth.Code from the first registration at 14.02.2013 (037XAGFKINCE2 , taken from Product information from our occount) we get a Cadian Launcher window with the message: "It""s wrong Autorization Code". When we tried to make a new registration in this site with the given interim code, we get "Product already registered" answer from site. Please tell us what should we do in order to can use that CADian2012 again. Thank You for your help. Szanto.