Unable to switch on download popup.Tried with below code it not working properly on clients server.
driver.switchTo().activeElement();
Robot robot = new Robot();
robot.setAutoDelay(250);
robot.keyPress(KeyEvent.VK_TAB);
robot.keyRelease(KeyEvent.VK_TAB);
robot.keyPress(KeyEvent.VK_TAB);
robot.keyRelease(KeyEvent.VK_TAB);
robot.keyPress(KeyEvent.VK_ENTER);
robot.keyRelease(KeyEvent.VK_ENTER);
Robot = new Robot();
robot.setAutoDelay(250);
robot.keyPress(KeyEvent.VK_ALT);
robot.keyPress(KeyEvent.VK_S);
robot.keyRelease(KeyEvent.VK_ALT);
robot.keyRelease(KeyEvent.VK_S);