As the videos says, Cloud Nine (C9.io) has closed for good. If you're taking a course of mine where we use C9 as the development environment, check the beginning of your course - I've added new videos that show you how to install the tools you need so that we don't need Cloud Nine anymore.

Use the contact link above to shoot me a message if you can't find the videos, or need any help at all...

-John Elder
Codemy.com