We commonly have users report that Scan2CAD will not accept their serial number when they are attempting to install Scan2CAD.
It is usually resolved with the same clarification…The serial number is not the same as the installation code! When installing Scan2CAD you will always be asked for your installation code first this is a two or three digit numerical code.
You will then be asked for your 30 character serial number.
Both of these codes were given to you when you purchased Scan2CAD via email.