Multiple Warnings

Hi, getting the following warnings on a site using this plugin. Any suggestions?

Warning: include_once(/home/xxxxxxxx/public_html/wp-content/plugins/acurax-on-click-pop-under/function.php): failed to open stream: No such file or directory in /home/xxxxxxxx/public_html/wp-content/plugins/acurax-on-click-pop-under/acx_onclick_popunder.php on line 29

Warning: include_once(): Failed opening ‘/home/xxxxxxxx/public_html/wp-content/plugins/acurax-on-click-pop-under/function.php’ for inclusion (include_path=’.:/opt/cpanel/ea-php72/root/usr/share/pear’) in /home/xxxxxxxx/public_html/wp-content/plugins/acurax-on-click-pop-under/acx_onclick_popunder.php on line 29

Warning: include_once(/home/xxxxxxxx/public_html/wp-content/plugins/acurax-on-click-pop-under/includes/hooks.php): failed to open stream: No such file or directory in /home/xxxxxxxx/public_html/wp-content/plugins/acurax-on-click-pop-under/acx_onclick_popunder.php on line 30

Warning: include_once(): Failed opening ‘/home/xxxxxxxx/public_html/wp-content/plugins/acurax-on-click-pop-under/includes/hooks.php’ for inclusion (include_path=’.:/opt/cpanel/ea-php72/root/usr/share/pear’) in /home/xxxxxxxx/public_html/wp-content/plugins/acurax-on-click-pop-under/acx_onclick_popunder.php on line 30

Warning: include_once(/home/xxxxxxxx/public_html/wp-content/plugins/acurax-on-click-pop-under/includes/hook_functions.php): failed to open stream: No such file or directory in /home/xxxxxxxx/public_html/wp-content/plugins/acurax-on-click-pop-under/acx_onclick_popunder.php on line 31

Warning: include_once(): Failed opening ‘/home/xxxxxxxx/public_html/wp-content/plugins/acurax-on-click-pop-under/includes/hook_functions.php’ for inclusion (include_path=’.:/opt/cpanel/ea-php72/root/usr/share/pear’) in /home/xxxxxxxx/public_html/wp-content/plugins/acurax-on-click-pop-under/acx_onclick_popunder.php on line 31

Warning: include_once(/home/xxxxxxxx/public_html/wp-content/plugins/acurax-on-click-pop-under/includes/option_fields.php): failed to open stream: No such file or directory in /home/xxxxxxxx/public_html/wp-content/plugins/acurax-on-click-pop-under/acx_onclick_popunder.php on line 32

Warning: include_once(): Failed opening ‘/home/xxxxxxxx/public_html/wp-content/plugins/acurax-on-click-pop-under/includes/option_fields.php’ for inclusion (include_path=’.:/opt/cpanel/ea-php72/root/usr/share/pear’) in /home/xxxxxxxx/public_html/wp-content/plugins/acurax-on-click-pop-under/acx_onclick_popunder.php on line 32

Warning: include_once(/home/xxxxxxxx/public_html/wp-content/plugins/acurax-on-click-pop-under/includes/acx-onclick_popunder-licence-activation.php): failed to open stream: No such file or directory in /home/xxxxxxxx/public_html/wp-content/plugins/acurax-on-click-pop-under/acx_onclick_popunder.php on line 33

Warning: include_once(): Failed opening ‘/home/xxxxxxxx/public_html/wp-content/plugins/acurax-on-click-pop-under/includes/acx-onclick_popunder-licence-activation.php’ for inclusion (include_path=’.:/opt/cpanel/ea-php72/root/usr/share/pear’) in /home/xxxxxxxx/public_html/wp-content/plugins/acurax-on-click-pop-under/acx_onclick_popunder.php on line 33