"the last instance" is a correct and usable phrase in written English.
You can use this phrase to refer to an event, action, or occurrence that happened at the end of a particular sequence or timeline. For example, "The last instance we saw the President was during the annual Fourth of July celebration."
(Presumably the exclamation point in the last instance is implied).
That was the last instance of a player-manager, a position once fairly common.
The Conservative government attacked, and yet in the last instance also protected, the Corporation.
The paradox of globalisation, Davos style, is that its massive transnational forces depend, in the last instance, on small-group or one-to-one debates, dialogues and pacts.
The game marked the first time since Oct. 1, 2005, that Florida did not score a touchdown, the last instance also at Alabama.
He tried this on JCPenney, the clothing chain Wet Seal and the Hannaford Brothers grocery chain, in the last instance compromising more than four million cards.
What happens on the earth when a moon dies is not easy to describe; I'll try to do it by referring to the last instance I can remember.
The last instance of the House being notified was 12 months ago, when Conservative MP Mark Pritchard was detained over a rape allegation.
Yet theirs weren't to be the last instances of lion attacks on the Lunatic Express.
The Romans became so desperate that they resorted to human sacrifice, twice burying people alive at the Forum of Rome and abandoning an oversized baby in the Adriatic Sea (perhaps one of the last instances of human sacrifices by the Romans, apart from public executions of defeated enemies dedicated to Mars).
The time elapsed between the first and the last instances of the clinician looking in the mouth was similar between experts and students.
