By the way, do you confirm you get the answer from the support team by email ?
Such email should be sent to 	jimmy.johnson@windstream.net 

Apart from that, I've just tried to run the autotest cases, for the jj_naturals_demo.ecf and nothing bad happened.
I also took time to update to EiffelStudio 20.05 

See the output, and the archive for 20.05

I had to modify the various .ecf to test, and then I was not able to compile the jj_big_numbers/demo project due to missing classes (MPZ_FUNCTIONS, ...).