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It's my system and there is an administrators account, I prefer to use an account without admin rights on the grounds that if my account cannot install programs or make system changes then any malware etc. that has a go at my machine is less likely to be able to install or make changes.
I have attached (I hope) a screen dump of the dialogue
It turns out the answer is to give invalid administrator credentials to the "run as" dialogue and the calling program will then complain it cannot do the update, the progrm name appears in the title bar of the resulting dialogue