You copy that Request Code onto a USB drive or a piece of paper and head to a machine that can browse the web.
If you are still reading because the fix didn't work, look at your specific error: adobe illustrator cs6 offline activation response code fix
Launch Illustrator CS6. When the "Serial Number Validation" screen appears, click . You copy that Request Code onto a USB
In 95% of cases, Illustrator will say "Offline Activation Successful." click . In 95% of cases