Conditional save return on Gutenberg Block

You should define your btntype attribute as type boolean and set its default to false (maybe better rename it to download then ;). And change it to true when the user selects the download option.
If you want to conditionally add the download attribute in your save functions’ JSX use this syntax: <a href={ btnurl } className="btn-trigger" download={ btntype }> and it will only add the download attribute when the condition is truthy.

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