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In order to modify the function to be asynchronous, you can use the async and await keywords. Here's an example:

async function downloadFile(url) {
  try {
    const response = await fetch(url);
    const data = await response.blob();
    return data;
  } catch (error) {
    console.error(error);
  }
}

In this example, the downloadFile function is now marked as async. Inside the function, we can use await to make sure that each operation, such as fetching the data, is complete before moving on to the next step. The try...catch block allows you to handle any errors that might occur during the asynchronous operation.

Note that if you're calling the downloadFile function from another function, you'll need to make sure that function is also marked as async and you use await when calling downloadFile.