Selenium | CSV file not downloading

[Sajjanparjapat]

public class SystemSetup {

	public WebDriver driver;
	public FirefoxProfile profile;
	public static void main(String[] args) throws InterruptedException 
	{
		SystemSetup ss = new SystemSetup();
		ss.LoadFirefox();
	
		//Calling TestDownload.., 
		ss.testdownload();
	}
	
	public void LoadFirefox() {
		
		//Setting up browser compatibility
		File pathToBinary = new File("C:\\Users\\sajjankumar.parjapat\\AppData\\Local\\Mozilla Firefox\\firefox.exe");
		FirefoxBinary ffBinary = new FirefoxBinary(pathToBinary);
		profile = new FirefoxProfile();
		
		//download Preferences
		profile.setPreference("browser.download.folderList",2);
		profile.setPreference("browser.download.manager.showWhenStarting",false);
		profile.setPreference("browser.download.dir","D:\\Selenuim");
		profile.setPreference("browser.helperApps.neverAsk.saveToDisk","text/csv");
		driver = new FirefoxDriver(ffBinary,profile);
		driver.manage().window().maximize();
	}
	public void testdownload() throws InterruptedException {
		// TODO Auto-generated method stub
		
		driver.get("https://www.sample-videos.com/download-sample-csv.php");
		Thread.sleep(2000);
		WebElement csvfile = driver.findElement(By.xpath("html/body/div[4]/div[1]/div[2]/div[2]/table/tbody/tr[1]/td[4]/a"));
		csvfile.click();		
		Thread.sleep(5000);	
		driver.close();
	}
}