If you have an "All Apps" plan, you can still install Fireworks CS6 from the Creative Cloud Desktop App . In this case, you do not need a serial number ; simply signing into your Adobe account activates the software.
Given that Fireworks CS6 is no longer supported or sold, users might consider transitioning to Adobe XD or other design tools within the Adobe ecosystem that can fulfill similar needs.
Searching for an " Adobe Fireworks CS6 Go to product viewer dialog for this item.