On behalf of Adobe …
To add to and confirm other information that others have provided earlier in this thread.
Issues in terms of activation absolutely cannot be resolved on these forums. They require a call to Adobe Customer Support. In the United States, call 1 (800) 833-6687. Even though the CS6 products are no longer officially supported in terms of technical issues, activation issues certainly are indefinitely supported. (If an agent indicates otherwise, immediately ask for a supervisor!)
Messages about licenses being revoked generally appear when Adobe detects that someone is trying to repeated activate a product beyond the two activations normally provided. This could be a sign that some criminal element has hijacked the serial number and is selling it to others. Note that if you have actually surpassed the two activation limit due to the need to replace a system (as you are apparently doing) and you didn't or forgot to deactivate the software on the systems being scrapped, Adobe Customer Support will normally grant you additional activations.
In terms of support of CS6 applications under the latest versions of MacOS and Windows, Adobe has neither tested such OS compatibility nor does it support same. The problem, simply stated, is that the operating system developers no longer guarantee application compatibility as they update their operating systems features. Previously, this was pretty much of a MacOS issue, but increasingly, it is a Windows issue as well. Generally speaking, the more complex the application (and Adobe's applications are large and complex), the more likely they are to be using operating system features that are either no longer supported or dramatically and incompatibly changed in the newer operating system releases. Part of the advantage of the newer subscription-based licensing is that as the operating systems change, updates at no additional cost are quickly released to the applications to maintain compatibility with the ever-changing operating systems.
And no, the vast majority of the “Creative Cloud” applications are not cloud-based. Yes, you install the application via download from servers, but after that, applications such as InDesign, Illustrator, Photoshop, Acrobat, Dreamweaver, After Effects, Premiere, etc. all run on your desktop system although there are some optional cloud-based services available from the desktop applications.
Hopefully this answers your questions. Call Adobe Customer Support and they should be able to resolve your issues by some combination of providing extra activations, unblocking the serial number, or issuing a new serial number. Please let us know if this resolves your issues.
- Dov