HI,
I try to reproduce the issue on the online version and as well on the downloaded version as well. I was able to move forward from the 5 percent mark. But What I think the issue can be your side is you might not able to see the simulink window that pop for each assignment.In that windows you will get similar interface that you get while doing the MATLAB onramp.
Attaching the screenshots for your reference
Thanks
Deepak