When you ask a question you need to provide some basic information
-Forum quick start https://forums.adobe.com/docs/DOC-5601
Mac or Windows, and EXACTLY which version of the operating system?
Recent Mac AND Windows operating systems have been known to cause "odd" problems
Are you using a computer Administrator account with full read/write permission?
CS3 activation server IS still working https://forums.adobe.com/thread/2209967
-and activate offline via chat https://forums.adobe.com/thread/2286195
Mac - OS Sierra version 10.12.5
And yes, I am the Administrator (it's my personal computer).
As for the two links you supplied, the CS3 activation server link says "Error not found", and the 'activate offline via chat' is what I was trying earlier, but Adobe won't give me anything other than self-help articles for my problem.
Any other suggestions would be greatly appreciated!
I have the same problem - Suddenly require an Authorization code for photoshop CS3 to work - i have the serial and activation nos : has anyone solved this? - adobe chat directed me to the forums??