The computer that I am installing my CS2 on is offline and will continue to be so. How do I get an authorization code for an offline computer? I can't find this anywhere.

CS2 + Acrobat 7 + Audition 3 (AND EARLIER) Activation Server is gone, so read below

http://helpx.adobe.com/x-productkb/policy-pricing/creative-suite-2-activation-end-life.html

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You MUST use the special version and serial number on the page, not your original disc or serial number

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NOTE that CS2 will not install at all on a "modern" Mac with an Intel CPU

When you install the special version of CS2 on a Win7 or Win8 or Win10 computer, you MAY need to right click the program icon and select WinXP compatibility from the option popup