Hello, the latest assets that are given with this project does not have explosions in them.
And Rick just went through modifying the already existed ones, so it is difficult to follow along.
I was trying to find free explosion assets but did not have much luck
I just tried and tested, explosions are cool in this war fx asset pack
Hope it helps someone else
Thanks for sharing, Naumaan! 
May I ask where you looked for the explosition particles? I’ve just checked the resources of lecture ‘Implement A Muzzle Flash’, and there is a zip. See here:
Thanks for your reply Nina, muzzle Flash is available but hit effect is not