: You must use the "No Activation" installer mentioned above. This version only requires a serial number and completely removes the need for a secondary authorization code. Security and Compatibility Warnings

: Under your account, look for "Registered Products" to find your original serial number.

In older versions like CS3, an "Authorization Code" was a secondary code generated during a phone activation process if an internet connection wasn't available.

: Adobe no longer supports phone-based activation for CS3.