The current, cloud-supported version of InDesign features automatic background cloud validation, seamless OS compatibility, and continuous feature updates via subscription.
Since CS6 transitioned to an "end-of-life" status, the validation process has changed.
Disconnect from the internet specifically directed by older support docs (though modern activation often requires it).
Many users looking for "exclusive" or older methods to activate CS6 run into significant issues due to the age of the software.