Hi, @Joseph Thomas
Thank you for posting in Microsoft Q&A forum.
The error 0x80072F78 means: The server returned an invalid or unrecognized response Source: Winhttp
You can temporarily turn off the firewall on the server and check if that resolves the error. Antivirus in some cases could also be the cause of this issue. Turn off the AV and see if that allows the prerequisites download.
If you are not a network admin, you can always contact your network team and explain them about this issue. If you think any other network device could be blocking the downloads, the network team should be able to resolve this issue for you.
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