Are we talking about buying the license or hacking Surveillance Station. If the latter, please be advised that piracy is not tolerated here. If the former you might not be able as I believe that Surveillance Station uses at least an officially valid paired S/N and MAC address to make sure you are on a real Synology.
If you really need to have additional surveillance station licenses then buying a real Synology box would be the way to go and using surveillance station with the real Synology hardware would be the only legal path.
I use to get that error message in 5.1 when trying to add 1 cam license that I paid for on xpenology. It turned out to be the MAC/Serial combination that was causing the error. Now sure this hacked software so ymmv for the future of this working forever.
Those looking to upgrade their surveillance solution can consider next-generation solutions from QNAP. These include QVR Pro, which supports up to 128 camera channels and can be integrated with QVR Face smart facial recognition (license purchase required), or the subscription-based QVR Elite to have up to 192 camera channels with subscription fees starting from only US $1.99 per month. Users can centrally manage all QNAP surveillance servers, including Surveillance Station, QVR Pro and QVR Elite servers with QVR Center. (Note: The maximum number of channels supported varies by NAS model, network configuration, and camera settings.)
To allow a smooth migration to next-generation surveillance applications, QNAP is offering Surveillance Station users with free QVR Elite 3-year licenses. Surveillance Station users can check if they are entitled to these free licenses on the event page: -elite-redemption. To learn more about QVR Pro, visit -pro To learn more about QVR Elite, visit -elite To learn more about QVR Center, visit -center 076b4e4f54