New
#600
ESD files to our members to make their own ISO files already available for download, UK & US English PRO x64 editions, see this post: Insider Announcing Windows 10 Insider Preview Build 14986 for PC - Page 27 - Windows 10 Forums
ESD to ISO tutorial: ESD to ISO - Create Bootable ISO from Windows 10 ESD File - Windows 10 Tutorials
There's nothing to worry, that warning first seen on Microsoft Community being somewhat pointless. Both EnableUUPScan and SupportsUUP DWORD values will be reset to default 1 (UUP enabled, no install.esd) when upgrading, and need to be manually changed to 0 after the upgrade if you prefer ESD file also in future build upgrades after 14986 (will work as long as Microsoft offers the ESD option).
Kari