I'm having the same issue. I've tried running as Admin, disabling IPv6, adding launcher to firewall. Deleting and Uninstalling everything DU related. Nothing is working. Game just keeps installing then closing out after install, so I re-launch Launcher and it just starts the install all over. I've sent in a ticket with my DXDIAG info. Hopefully they'll get back to me someday as to whats going on, if & when they do I will also mention here what was found.
I'm using
i7 6700k Skylake
GEFORCE GTX 1070FTW
Windows 10 Pro
Everything is within DU recommendations