Due to a technical issue, Adobe has disabled the activation server for CS2 applications, including Acrobat 7. You can find more details on this “Activation server unavailable” error with this link :
https://helpx.adobe.com/creative-suite/kb/creative-suite-2-activation-end-life.html
To obtain CS2, make sure that your computer meets these requirements:
Then be sure that you have an Adobe ID. You will need to sign in using your Adobe ID (usually your email address) and password. If you don’t have an Adobe ID, click Get an Adobe ID when required.
Then link below and locate the language and application you want to install and note its serial number (located to the right of the download links). The serial number is required during installation.
Finally click the download link for the application or applications you want to install.
https://helpx.adobe.com/creative-suite/kb/cs2-product-downloads.html?promoid=19SCDRQK
For Mac users, you’ll probably need more action de perform for installing Adobe’s software, just follow one of this solution :