Here is a bit of useless information for you!
I setup a trial of a V9 instance of Microsoft Dynamics 365 for some testing, and I found that the Adxstudio 7 solutions would not import. The installer goes in, but installing the base portals solution fails.
To get round this, I converted the instance to a sandbox, reset it to V8.2, installed the solutions, and I intend to upgrade it to V9, although I will have to wait a week for the scheduled update to work.
So there you have it. You cannot set up a new V9 instance to run old portal code on.