S3 Get object not working properly in Unity

I am using AWS SDK .NET for Unity to download zip files from S3. I implemented the get method just as this tutorial for .NET https://docs.aws.amazon.com/AmazonS3/latest/userguide/download-objects.html But when I call the method with ReadObjectDataAsync().Wait(); Unity stops and crashes, like is in an infinite loop. This is my code, has a different name but is practically the same:

/// <summary>
/// Start is called before the first frame update
/// </summary>
void Start()
{
    customSongsManager = gameObject.GetComponent<CustomSongsManager>();
    GetZip(S3SampleFile).Wait();
}

/// <summary>
/// Get Object from S3 Bucket
/// </summary>
public async Task GetZip(string pFile)
{
    string folder = "Assets/Audio/Custom/";

    try
    {
        GetObjectRequest request = new GetObjectRequest
        {
            BucketName = S3Bucket,
            Key = pFile
        };
        using (GetObjectResponse response = await S3Client.GetObjectAsync(request))
        using (Stream responseStream = response.ResponseStream)
        {
            string title = response.Metadata["x-amz-meta-title"]; // Assume you have "title" as medata added to the object.
            string contentType = response.Headers["Content-Type"];
            Debug.Log("Object metadata, Title: " + title);
            Debug.Log("Content type: " + contentType);

            if (responseStream != null)
            {
                using (BinaryReader bReader = new BinaryReader(response.ResponseStream))
                {
                    byte[] buffer = bReader.ReadBytes((int)response.ResponseStream.Length);
                    File.WriteAllBytes(folder + S3SampleFile, buffer);

                    Debug.Log("Writed all bytes");
                    StartCoroutine(customSongsManager.ReadDownloadedSong(folder + S3SampleFile));
                }
            }
        }
    }
    catch (AmazonS3Exception e)
    {
        // If bucket or object does not exist
        Debug.Log("Error encountered ***. Message:"+ e.Message + " when reading object");
    }
    catch (Exception e)
    {
        Debug.Log("Unknown encountered on server. Message:"+ e.Message + " when reading object");
    }
}

The game crashes in this line: using (GetObjectResponse response = await S3Client.GetObjectAsync(request))