CS3 - replacement install (no activation)

I can no longer access my CS3 apps, because Adobe has turned off the activation server. This page:
https://helpx.adobe.com/creative-suite/kb/activation-fails-cs3-acrobat-8.html

Activation or connection error when starting CS3 or Acrobat 8

has instructions for downloading a new installer, and gives a new serial number for the product.

I uninstalled CS3 as directed, restarted my machine, then ran the new installer. There was NO prompt for the new serial #. When I started Photoshop, it just gave me the same error message (that the activation server could not be reached). I still don't know what I'm supposed to do with the new serial number, and I don't understand why this new install is still looking for activation - according to the web page, it should no longer do that.

I waited four and half hours in the support chat queue to be told that they couldn't help me - even though it's their fault for turning off the activation server and having incorrect information on what they called the 'self-help' page.

Do I sound frustrated and angry? You betcha! I've lost a whole day of production to this issue, stuck without Photoshop.

Still, I like to be optimistic - has anyone else come across this issue, and does anyone know how I can get my trusty CS3 working again?

All answers appreciated!