AI Assistant

Seeing Jason demonstrating new Bricscad AI Assistant in '3D model and length/thickness issue':
a) which version was this introduced?
b) having not renewed my BC subscription beyond 23.11.25, am I still allowed to download the current version of v26?
c) if not, I have the v26.1.05-1 installer msi. Can I still install it, if that version includes the AI Assistant?
d) after all that, can I still use the AI assistant if I have no current maintenance contract?