install demo

Your demo data is installed but the problem is about the permalinks which seems does not work with plain permalinks as well as with post-name/ permalinks structure. 

Going into a little details i found that you are using Hosting server Nginx server, which is not like linux where WordPress can create .htaccess to handle permalinks and modify server responce style. 

And the Microsoft IIS server in which WordPress create and modify web.config file to handle permalinks not like these both server types the server type Nginx needs modifications by Administrator more details can be found here >> https://codex.wordpress.org/Nginx

and recommendation is to contact the hosting provider thanks