CS2 Phone Activation?

I was given a copy of Adobe CS2. The previous owner deactivated on his cpu prior to giving it to me. This copy is complete with all disks and serial #. When I installed the final disk , it prompted me to do a "phone activation" and to provide an activation code from it. I had no luck using the phone number. Customer service was less than helpful, basically saying, "CS2 is an old program. We no longer support it. Sorry. Ask the forums." I have every disk and with the serial. The only thing stopping me from using the program is this phone activation code. Am I really out of luck? Any help would be greatly appreciated. *Windows 10 OS