You can call Sage support for a pw over-ride

Correct, the software would have required a password be set for the sysadmin user. If this is unknown, a password override request can be asked of the support team. KB 10362 provides you with additional details. You can contact Technical Support at 1-888-522-2722 to request a password override which is a chargeable service if you're not on an active Sage Business Care plan.