When you are opening your Website if it prompts to download the file name "download" there is an issue in your .htaccess file Please goto your filemanager and edit your .htaccess code
You can able to find the following code
# php -- BEGIN cPanel-generated handler, do not edit
# Set the “ea-php56” package as the default “PHP” programming language.
<IfModule mime_module>
AddType application/x-httpd-ea-php56 .php .php5 .phtml
</IfModule>
# php -- END cPanel-generated handler, do not edit
Kindly remove the following code and Save the .htaccess file
Now you can try to access your site it should work (Make sure you have cleared your browser cache)
If your sites shows 500 error make sure you are using proper PHP Version
