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This question already has an answer here:

I have tried UnregisterExternalEvaluator only to find that the item's state "Registered", changed from True to False. But I want that item to disappear from the results given by FindExternalEvaluators.

enter image description here

Well, as shown in the figure above, because the version 3.6.3 is actually no longer existing, I want that somehow Mathematica does not know that information any more.

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marked as duplicate by Szabolcs, Community Sep 2 '18 at 9:50

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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Just evaluate these commands:

ExternalEvaluate; (* trigger autoloading *)
ExternalEvaluate\`Private\`resetCache[]

See this post for more details

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