Did you run the installation once? I’ve never received this error so maybe there was a network error that corrupted one of the files the integrated installer was trying to download. Run the installer once again and report your results back to us.
If this fails you can always install the XDK manually IoT - Getting started with the Intel® XDK IoT Edition | Intel® Developer Zone
Do you still need assistance with this thread, were you able to install the XDK successfully?