Launch Illustrator CS6 and navigate to the screen.
Often, the response code is correct, but Illustrator's local cache is corrupt. adobe illustrator cs6 offline activation response code fix
: At the Serial Number Validation screen, try pressing Ctrl + Shift + Double Left Click (Windows) to manually trigger the challenge/response sequence . Launch Illustrator CS6 and navigate to the screen
C. Reinstall using official installers
When you try the response code, you might see specific error messages. Here is what they mean: the response code is correct