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Error when upgrading to Windows 10: 0xC1900101 – 0x30018 - Microsoft Community
You can try 2 things: make a UA build by integrating only the "cumulative update for Windows 10 Version 1607" and "Update for Windows 10 Version 1607" with free nlite software or other.
Or join the insider build program to see if the latest version (14986) installs without problems. It will be finalized in three months under the name redstone 2 or update creator. You can install it on a second partition or hard drive Rejoining Insider Program . On the other hand I do not know if you can get it with Windows 10 Version 1511.