I have not yet installed 1903 but every prior version has worked exactly like that, you can run setup from the root of the ISO and choose to keep everything.
You can upgrade by 1903 ISO, as long as the 1903 iso is the same language and architecture as the current 1803 install.
If there's a update on day one of 1903 version, the MSDN ISO version will be updated to this "final version"?
kb4495666 (18362.53) is publicly available, for all who installed 18362.1 or 18362.30, same for the flash update (CU and Flash updates are also available on ms catalog): https://forums.mydigitallife.net/threads/windows-10-hotfix-repository.57050/page-386#post-1514585
notice photo viewer version xxx.30 is much better than xxx.1 photo viewer can edit, adjust, crop, effects... my 2 cents Charl
Difficult to predict, but you think that the ISOs available late may will be the 18362.1 (the same as those available on MSDN or UUP, etc ...) or Microsoft can compile a new build ?
Anyone have german versions of: de_windows_10_business_editions_version_1903_x64_dvd_fd8d94a0.iso de_windows_10_business_editions_version_1903_x86_dvd_913365d1.iso thanks.
MVS also known as MSDN versions are about as official as you can get and they are out and available for download.
This ISO is for developers and not for end-user. So I wait a month to see if RTM will not change to 18362.53 or another build and download the full ESD file. Things can be changed.