Error : A valid URL was not provided.

Hi

I am getting the following error :

The plugin encountered an error while downloading the zip file,the following error message was returned:
Error Message : A valid URL was not provided.

Temporary files created in /var/www/wordpress/wp-content/wpclone-temp will be deleted.

Please let me know how to fix this.

https://www.ads-software.com/plugins/wp-clone-by-wp-academy/