I can not uninstall completely

I can not completely disassemble

I decided to test your plugin
I installed, but I did not like it, changed my cart, I wanted to mix physical and digital items and I did not like that the plugin changed everything.
even uninstalling the plugin will get the message “Missing a required plugin!
Please install / activate WordPress Download Manager to use WPDM – Premium Packages plugin ”
but I want to delete everything related to the plugin. I can not.
broke the downloads he already used with another plugin. broke everything.