Hi,
Thanks for providing such detailed information.
The issue you are experiencing is not caused by the VMware Software Manager - Download Service software you are running on your machine. It has to do with another unfortunate problem we've been seeing with VMware infrastructure.
It should also affect your ability to download VMware products directly from our Web site - My VMware.
It seems only some of our customers are impacted by it, and apparently you are one of the impacted users.
Hopefully this issue will soon be resolved.
For further assistance, please contact the Global Support & Services team at my.vmware.com so VMware can best assist you with your issue
HTH,