That is pretty definitive. They closed their commercial space and have no new address registered with the SoS in their state.
That is pretty sad, I use S3D for complex builds and dual filament prints, CURA totally sucks at multi filament controls. is there any other slicer that handles complex prints like S3D's multi-process setups? CURA is also dog slow at most things, but it handles network connections like Octoprint and Duet fantastically. CURA also has tree supports - This alone keeps me using it. I have tried some other slicers, and found that they often network to their own hardware well but not at all to RepRap stuff that isn't bound to the printer hardware company. The sophisticated slicers with halfway decent GUI's are quite complex and do not hold your hand as well as S3D did with a new user. This makes them a bit daunting. S3D's tutorials were really informative, does any other slicer offer tutorials that good?
I am a die hard S3D fan, but with this information in the link above, I think that it is time to move on before their servers go dark and the software stops allowing license transfers.
Robotics and sensors engineer
And lots of other stuff for fun.