Difficult to Delete the Plugin after installing once

I have installed this plugin on the recommendation of Neil Patel, wathing a youtube video of his Channel. He recommended to use this pluging for best result. I know the coding, but I wanted to save my time. So I donloaded this plugin. But it is a premium plugin, hence I want to delete this. But I couldn’t Delete this plugin. It Shows error. The worse plugin I ever downloaded on my wordpress website.