.htaccess file is missed
We have found that sometimes the '.htaccess' file in the script's root directory will be missed if you use the cPanel online extract tool to unzip your file.
On the other hand, if you upload file by file from Windows, sometimes the .htaccess file is also missed.
It's easy to resolve. The .htaccess file is contained in the zip file you downloaded from Codecanyon. You only need to unzip and re-upload it to the remote script's root directory.