The CS2 activation servers were taken off line some time ago.
Adobe has provided a different set of CS2 downloads to install that don’t require activation as long as you enter the serial number shown on the download site:
The activation server was decommissioned in 2012 so you cannot re-install CS2 using your existing DVD and serial number.
However, as an existing CS2 owner, you can download a new version of CS2 from Adobe which no longer requires activation:
You must use the new serial number provided at that link. Your existing serial number will no longer work.
I particularly liked ssprengel's question in the other thread, and would love to hear an answer.
Are you saying that purchasing it 7 years ago was a waste of money?
If you did purchase it new back in 2005 (which by my reckoning was more like 9 years ago - time flies), I wonder what you would consider a good value in software, or an acceptable level of long-term compatibility...
I did a count. I only ever use two applications from that long ago, and both have less usability than they had then because today's computing environment is so different from the one for which they were designed.