My Grandmother told me the last sanctioned hunt of Aborigine people in Australia was in the middle-to-late 19th century, is this true and was there any reaction from other countries?

I can't remember the exact date she told me unfortunately. My Grandmother was born and raised in Australia before marrying my Kiwi Grandfather and emigrating and she was always staunchly supportive of equal rights for the aborigine people of Australia. If there was sanctioned hunting of humans in the 20th century was there any outcry (or any response at all) from people such as diplomats or any non-Australians, either within Australia or overseas?

Clarification: Are you asking about the 19th or 20th Centuries? The word "hunt" is also quite specific; as although those sadly did occur, there were also what would be properly termed "massacres" which occurred much later. This may be a case of language changing over time, too.

As an aside, many Aboriginal people find the word "Aborigine" offensive as it was a term imposed by the European colonists. It is a complicated issue, but in general "Aboriginal People(s)" is the most culturally appropriate, and you should always capitalise the "A'.

Source: NSW Health (Australian State of NSW Government Health Department) has a guide to this here (refer pages 11 and 12)