`rustup update` in windows gives torjan virus alert and cannot update

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This has been a recurring issue with new versions of Rust. Some virus checkers seem especially eager to declare new things as viruses until enough people report a false positive.

In this case it looks like it's complaining about a javascript file in the docs. As a workaround you could try installing without docs.

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For an existing installation, rustup component remove rust-docs, and then try to update.

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