Current HyperSizer Version 5.6.38:
You could export the model into Nastran format, but unfortunately unless you have a nastran solver, there would be no way to get loads into HyperSizer.
At one time we had a neutral file format that could have been used for this purpose, however, recent changes to the software have apparently made this neutral file format unusable. We will be looking at that in the months to come and if there is any progress on using a neutral file to pull in information, I'll be sure to post back here.
Thanks,
Phil