Uploading Demo Template in the theme

Hello,

I’m using the TravelWP theme to build my website from a fresh wordpress installation. However, after the theme installation, when i try to load any of the demo template i face 2 issues:
– Either the demo doesn’t load completely (stop before 100% loading and never continue)
– Or the demo load completely, but some section like (like slider, etc) are not visible on the site (different section after many trials).

I’ve have installed all the required and recommended plugins, i’ve try loading the demo with all the plugins enable/disable (all together or 1 by 1), i’ve uninstalled and reinstalled wordpress and reinstalled the theme, etc.

Please need help / advice ASAP.