In BobCAD your licences are locked to the computer you are using unless otherwise deactivated and transferred. 

In the BobCAD software click File > Help 

From here, under Licensing, you have Activate licence or Transfer Licence. We need Transfer Licence.

Its best to go via the internet but you can use the 'Manually via E-Mail' option

Take note of the Licence ID being removed as if you have multiple licences you will need to make sure you have the correct password otherwise you will not be able to log in again.

Confirm and finish and you have removed the licence. 

Open BobCAD on the machine you want to activate BobCAD on and follow the activation/Registration Wizard to activate your licence.