Thanks Chris,
I have since discovered the output folder.
It has now completed VOB_01
But it is only 19 minutes and 126.318 MB (126 MB)
So unless it re-joins them all later, then a bit more investigation is required.
(But I'm not holding my breath)

The only other problem so far though is the "VAST" amount of resources it is using.
(Good job I have another PC)
But for free, we can't complain.
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Well it did'nt automatically join the 4 files it made, I had to join them myself.
With converting from .avi to DVD format.
I think I'll be giving it a miss in the future, as it was taking far too long to convert a movie ( cancelled after 3 hours) to or from .avi or .vob
Maybe it has a place somewhere, but not on this PC.
But for free, we can't complain.