HootKit Will Not Install

I have been trying to install the plugin, but I get this message:

Plugin could not be activated because it triggered a fatal error.

Warning: require_once(/var/www/wp-content/plugins/hootkit/include/class-activation.php): failed to open stream: No such file or directory in /var/www/wp-content/plugins/hootkit/hootkit.php on line 92

Fatal error: require_once(): Failed opening required '/var/www/wp-content/plugins/hootkit/include/class-activation.php' (include_path='.:/opt/remi/php73/root/usr/share/pear:/opt/remi/php73/root/usr/share/php:/usr/share/pear:/usr/share/php') in /var/www/wp-content/plugins/hootkit/hootkit.php on line 92

Any idea what I can do to resolve this?

The page I need help with: [log in to see the link]