Apologize for the frustration. See System requirements | Adobe Creative Suite 6 for the system requirements for Fireworks CS6. It states that the supported versions are Mac OS X v10.6.8 or v10.7. Adobe Creative Suite 5, CS5.5, and CS6 applications support Mac OS X Mountain Lion (v10.8) when installed on Intel based systems.
Fireworks CS6 has not been tested to work on later versions than what is stated in system requirements. In my opinion, your best bet would be to use Fireworks CS6 on a supported version, or the version of OS that worked previously. If there is a better answer, I hope that the other users on this forum will be able to provide that here.
Nice try, Peran. If you sell the product on Creative Cloud, then it rolls forward with creative cloud, no matter what disclaimer you put out. Unfortunately your legal department wrote that back when Adobe was still selling boxed versions of the Creative Suite, and your legalese has not kept up with Cloud technology. By maintaining it in the Creative Cloud group it now becomes subject to THOSE RULES, which state that the products in the CC application are updated continuously. SO, either you get the Fireworks code fixed that is part of the suite that I'm paying for monthly, or drop it entirely, but you do not get to have it both ways. If it's under the Creative Cloud, then it needs to be supported on ANY SYSTEM that CC operates on. This one is a legal issue above your pay grade. You might want to join the people in tech support and forward it up the line. If you do drop it, you owe your users of it for the last 36 months of issues that have been brought about by changes in OS-X that Adobe has not addressed in back-end code cleaning. It would be one thing if this was a tiny company, but with your billions, surely you can afford a couple of engineers' time to patch the back end to be OS-X compliant and keep your customers using it daily HAPPY.
I agree with Brian. Even aside from the legal side of things to keep selling a product while not updating and supporting it, at the very least it is highly unethical and misleading. It just makes no sense.
And, as far as I can tell, Fireworks can no longer be purchased through the website as a stand-alone product - so why is it still part of CC when it is inoperable or half-working on El Capitan? It IS misleading.
Unfortunately, I do not think Adobe's management cares one bit. It is not as if this is setting a precedent - same happened to Freehand, and currently (seemingly) Edge Animate (and other Adobe applications have bitten the dust in a similar fashion).