Select "Request an activation code using an offline method" and click Next.
A: You can usually find your product key and serial number in your Autodesk Account. If you need a new activation code because you've exceeded the maximum number of automated activations, you will need to contact Autodesk Activation and Registration Support. autodesk inventor 2015 activation code
Avoid formatting hard drives or upgrading major OS components on machines where Inventor 2015 is currently activated. Select "Request an activation code using an offline
portal on a connected device. After verifying your perpetual license, Autodesk provides the final Activation Code Autodesk provides the final Activation Code