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The ISOs for 15603 are available direct from MS on Slow Ring download site.
Windows 10 ISO Download - Windows 10 Installation Upgrade Tutorials
Are they final release versions or just Insider Builds?
Can you post your winver showing 1703?
I got mine from the Russians - they had it a month ago!
Most of us have had that exactly same version and build for some time now. It's not leaked, it's not unofficial, it's just a regular Windows 10 Creators Update Pre-release Version 1703 Build 15063.0. You don't have to be an Insider to install it, just ask official Microsoft ISO from any Insider or download from Internet. No ESD needed when you can get an original ISO.
OK, so you answered my question and I thank you for that.
Regards,
WOT