Hi,
This issue is about the web platform installer.
Please check if you are suing a proxy. If yes, please try to download withou proxy.
And also check if the firewall or third party firewall is turned on. If yes, please turn it off.
An article about troubleshooting Problems with Microsoft Web Platform Installer:
http://www.iis.net/learn/troubleshoot/web-platform-installer-issues/troubleshooting-problems-with-microsoft-web-platform-installer
If this issue still exists, I suggest you create a new thread on Web Platform Installer forum for help. The reason why we recommend posting appropriately is you will get the most qualified pool of respondents, and other partners who read the forums regularly
can either share their knowledge or learn from your interaction with us. Thank you for your understanding.
Web Platform Installer forum:
http://forums.iis.net/1155.aspx
Best Regards,
Wendy