If you've been a Reset the Sage 50 Default Admin password user for some time and haven't changed the default admin password, it's time to change it. If you have five single-user units, activating all of them will give you a total of five licenses. The default password given are 'UBS', and you have to change it to your own password to maintain the confidentiality of this system.
Source: https://www.accountingproblem.com/reset-the-sage-50-default-admin-password/