thank your for the purchase.
Most server (shared hosting) are very slow, so it’s very hard to import the demo content with all images at all. But thats normal, if you don’t have an own server, you have to live with it.
Can you send us ( info @ 7theme . net) the URL for your website, then we can take a look at it.
You can change it there: WordPress admin -> Appearance -> Theme Options -> Header Section -> City
Color of the prev / next squares:
Thats are the UI colors, you can change it here: WordPress admin -> Appearance -> Theme Options -> General -> Shortcodes -> Userinterface colors