Recently I purchased the All in One Video Downloader Script but the support is not responding.

Greetings!
I’ve purchased your script and unable to setup this script, please show me some tutorial how to setup your product.
I just simply installed the Wordpress and upload the plugin and theme of yours from files folder, my site’s homepage is showing blank https://buzzfeed.cf/ please guide me in this.
Link: All in One Video Downloader Script by NicheOffice | CodeCanyon
Thanks.