When you first open your Sage software, the program prompts you to enter your serial number and activation key. NOTE: For help with checking your activation details, follow the find your Sage serial number, activation key and account number article. Location of activation details The table below shows where you can find these details in different Sage software. Software | How to get there | Details available: | Serial | Activation | Sage 50 Accounts | Logon as MANAGER then click Help and click About. | Y | Y | Alternatively, click Tools then click Activation and click Upgrade Program. | Y | Y | Sage 50 Payroll | Logon as MANAGER then click Help and click About. | Y | Y | CIS Sage 50 Accounts | Click Tools then click Activation and click Enable CIS or Construction Industry Scheme. | Y | N | Sage 50 P11D | Click Help and click About. | Y | Y | [BCB:19:UK - Sales message :ECB] |