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%