HyperWorks Student edition download problems

Hello,

yesterday I ordered the HyperWorks student edition. The order (Order Number: 46826) has been approved in a short time. But after that I got some problems downloading the files on this website: https://secure.altair.com/onlinestore/index.php?main_page=hwdownload.
Every time I started the download in firefox using windows 10, the file is downloaded till the end (downloaded data size: 1,56 GB) . But after it finished, a message said that the download failed. I tried this several times and with different browser but i got the same message every time after finishing the download.

I hope you can help me with this problem and I would be very grateful if you can help me with this problem.

Timo