OKHi,
please send %temp%\ntlite.log at that moment?
If you did not press the upper left Cancel button on the toolbal, then a cancel is misread and should be fixed, should be readable from the log.
Thanks, but keep the negativity down.
Sent you a test version, it should now report the real error.
Should be the ISO is corrupted, a file cannot be read during prepare data phase.
Try to get another original non-edited ISO, or if you are 100% certain that ISO is valid, then DM me the newly mentioned file found in right-click loaded image Explore mount directory, then paste in File Explorer search to find it.
Why doesn't the older version have this problem? It's the same WIM file.