Sage 50 Serial Number And Activation Key – How to get it First, do you already have a copy of this software? If no, you can always try the Sage 50 free trial version anytime until you are ready for an upgrade. A person from a non-accounting background can use the Sage 50 software perhaps due to the friendly interface. If you have recently purchased a copy of Sage 50 software, you must activate it before you use. If you are a new user who just purchased the software from a retail store, activation can be done online at the customer portal. Meanwhile, you can also find your Sage 50 activation key on the CD case. Those are actually the two ways to get the product activation keys of Sage 50.