Installing theme issue

When I down loaded and installed the Unite theme via theme install ( file) or manually via ftp.

I do not get any content in the theme (there isnt any menus, images, pages, shortcodes, etc.
Do I need to upload a demo file or am I missing something from the zip file.

I have attached the zipped file.
Please advise.

I’ve installed the dazzling WP theme onto the webserver. When I’ve tried to open our webpage, received the following error: Fatal error: Call to undefined function get_header() in /home/aramlasb/public_html/index.php on line 10

Could you help me what to do.

My second question is.
According to the documentation, after downloding the theme I shoud activate it using Dashboard/Themes. But I’ve not got permission to it. Could you help me, what shall I do.
Thank you,