I cannot find any instructions on how to delete the previous copy Layerslider
Thank you for getting in touch with us!You can disable and remove the LayerSlider previous version from the plugins menu in your WordPress. If you have a theme bundled version on your site, then usually you can remove it in the theme settings.Here is a link in our documentation page about how to update the plugin:https://layerslider.kreaturamedia.com/documentation/#updating
If you will have any other question, feel free to ask.
Best Regards,Kristof Molnar | Kreatura Support Team