So there is something wrong with the App Engine: 3 Ways: Challenge Lab - ARC112.
I have managed to clear all tasks except Task 2. Download the Hello World app
No matter what, it shows an error stating to download the app using language of your choice. I tried running the commands multiple times, refreshed the task page and restarted the vm instance to no avail.
I am not sure how to download the app from github repo. What I did was re-read the Task 2. Download the Hello World app after a short break to de stress.
Download a simple Hello World app from the relevant repository according to your choice of language for deploying the web application on the VM instance lab-setup at the $HOME directory (~/).
I noticed it mentioned instance and so ran the command to download in SSH and voila, task 2 was done after multiple attempts to find a solution.