After trying a couple of "popular" (non-commercial) products and losing so many hours... I got the JX Comments, which took me less than 5 minutes to install and set up it!
Most important? It works perfectly!
Definitely, it worths its money!
Congrats to its creators!

I used to have the free one (and it was working fine) however, I now have the PRO version (because of the additional features).
Easy installation and so, so user friendly!

Thank you!!!