Authorization Code After Effects CS3

I'm reinstalling After Effects CS3 that I purchased onto my old Mac Notebook. The installation went fine but when I open After Effects a pop-up asks for an Authorization Code. Since the online activators have been shut down, I can't get the authorization and Adobe Support basically sent me here since the old software is no longer supported; how do I go about retrieving a Authorization Code so my program will not stop working after 30 days?

I love this program and I'm really hoping tobypass this obsticle. Please help!