How to delete unused domains in wpdatatables

How can I delete any old domain associated with my wpdatatables plugin?
I have thoroughly look for way to do it, but it seems activating a site is easy, but deactivating it is not.

The problem is that I have no clue what domain I made the last activation, but I’m possitive it is not active now.

Thanks for any help!

There should be an option in plugin settings. If not exist then you have to contact plugin author how to deregister plugin license.

How to contact an author to get support for any Item issue or for any technical query: