Could it be possible that someone (who has access to your creative cloud login data) used it either on purpose or unknowingly?
In case you are using creative account for teams - think you can deactivate connected devices somewhere in the account settings.
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CS6 perpetual Mac is version 13.0.6 Windows is version 126.96.36.199 Subscription cloud version is 13.1.2. If you have a cloud subscription and a perpetual licence you would not be able to have both version install at the same time on same machine. What does your Creative Cloud desktop application show and if you start CS6 if the flash screen shows or you can get to menu Help>About Photoshop what version i shown 13.0.6 or 188.8.131.52 or 13.1.2?
Amitabh, as per your account details, you already had your subscription activated on 2 machines and that's the reason you were getting error "Maximum Activations Exceeded"
I have deactivated both your machines from our end. I would suggest you to re-activate those machines now using the same Adobe ID & password and check if they work fine now.
Let me know if you still get the same error.