Hi, Ofi Khan
I did share this info in my first post but I will send it again in the Hidden Content box.
Please note, the 404 error was due some catch that SP page builder was not cleaning and I believe that is resolved, the issue now is the site doesn't show well in mobile version, when viewed on my phone the menu doesn't work and it gets hidden when clicked on, the slideshow images and text overlap and so on.
Main issue now is to get the menu to display well in mobile and the slideshow to not overlap , I checked the demo on my phone and shows okay but installing the quickstart package doesn't help... something is diferent on your demo site.