If you own a valid CS6 serial number from a past purchase, downloading a backup installer from a third-party archive is morally defensible. If you never paid for Fireworks, you should explore free alternatives.
Adobe Fireworks CS6 has been officially discontinued and is no longer available for purchase as a standalone product. However, Download Adobe Fireworks Cs6
, a free web-based editor that can open and edit native Fireworks files with their original layers intact. If you own a valid CS6 serial number