You can follow this guide from the official uup dump tutorial: So, after unzipping the downloaded package from uup dump create the UUPs folder and put in the dotnetcu, flash removal update and the defender update kit cab (optional) and start the download cmd.
Yes, after first running the conversion + updates integration scripts run a new updates integration script, of course you can but that is a bit redundant isn't it?
19041 is because 19042 is a fake registry only build. 19041/2.621 does not exist so please show the info from the conversion or at least the iso filename of the created iso.
[===== 10.0% ] [==========================100.0%==========================] The operation completed successfully. this normal? 10%