Do not extract the zip to the \23.0.1.3 folder or just put it there that will not work, not against the error message. You must put the zip in the \zip folder after deleting the existing zip code, you may need to rename the zip code you downloaded: 2A3A8A6D6826EF6CC653030E7D695C41.zip
But if you do not want to manually download the support repository, you can simply delete everything in the %USER%\AppData\Local\Xamarin\ folder and rebuild and wait.
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