I just had the problem for sw 2016 sp5, it downloads a file and then it freezes. I reclicked x times until it restarted, it downloads, it blocks, you click again ect........
When I have this problem I download it directly on the official portal, and with mozilla firefox, because you can resume downloads that are blocked... you can find a free portable version on their site... it allows you to have it without installation;)
I started the download in the morning, in the evening it's good. But you have to watch to restart the download when it freezes. Sometimes I clicked maybe 20 times before it started again.
I installed SW2016 on a workstation but I have a message asking me to upgrade the solidnetwork license. I contacted the hotline, I'm waiting.