Another new insider build just dropped today.
This one is Windows 10 Redstone build 14383
& is for both PC and Mobile.
I used Windows Update to install it & used "disk cleanup" afterwards to dump all the leftover files.
The watermark is gone now so it appears there will be no more watermarks on Redstone which will be the Anniversary Update (AU) to be released August 2.
This is the second RTM of Windows 10, the third wave will start after AU comes out.
corner w/o watermark now https://blogs.windows.com/windowsexperi ... nd-mobile/