So instead of :
<a href="https://darsequranmardan.com/wp-content/uploads/2018/01/4 Al-Rad Ayat-1 Part-2.mp3">Download</a>
Your html link would be:
<a href="https://darsequranmardan.com/wp-content/uploads/2018/01/4 Al-Rad Ayat-1 Part-2.mp3" download>Download</a>