unable to activate adobe acrobat standard 8.1 after operating system change

CS3 and Acrobat 8 activation server is retired see reply #1 https://forums.adobe.com/thread/2372929

-you MUST use the special serial number AND the special installer, not your originals

-above includes a link to get the special version AND links to help with activation problems

-more information on activation problems with the new version https://forums.adobe.com/thread/2385900