Content Transfer

If the client needs to be able to access and edit a course in the future, they will need the .story file for Storyline courses.

One thing missing from that list is to transfer ownership of Rise courses. Or, if you don't have a Teams account, to send a copy of the course. 

If they just want an easy way to review what's in the course (or that's all you've contracted to give them), you could publish a Storyline course to Word or for the web. 

You can also publish a Rise course for the web. Or it can be published as a PDF, though I think those require a lot of editing to look good.

The other option for either type of course is to copy and paste text and images (possibly including screenshots) into a custom document that shows and explains how the course works.