I've been working through the System Architect Essentials (7.2) course. The content of my online exercise system disappeared. suggested using the downloadable exercise system, and even gave me a jar to import to restore the content. The trouble is, it's a 7.1 system and although I got it working and the import appeared to go smoothly, the content did not show up. As an alternative, I would be willing to start over, which although cumbersome would be a good review. But the 7.1 system is not equivalent so the directions don't apply. I only have 13% of the course remaining - how can I get a 7.2 image that is prepared for the 7.2 course material?
You should be able to open an exercise system by clicking the Open exercise system link at the bottom of any of the exercises. Seems that yours may be messed up. I will have the team reset your exercise system so you can restart the exercises.