How long ago did you attempt to install Cloud9? It's recently been updated (~2 months ago) to the new V3 which is much easier to install and run offline (https:

How long ago did you attempt to install Cloud9? It's recently been updated (~2 months ago) to the new V3 which is much easier to install and run offline (https://github.com/c9/core https://github.com/c9/core)