I had both the same and similar problems loading the Heavy Steam ULT. After about 5 time consuming tries I got it loaded. There were several different error messages along the way, one of which I do not remember filled the entire HC-2 screen with verbiage.
To the point: Ring does not have the old Heavy Steam on the RailPro Assistant. If someone still has it, would it be possible to copy it, post on this web site a, download to computer and then load from there to HC-2 – legally as well as technically? If so, any volunteers?