The plug-in can not be activated because it causes a fatal error.
Code:
Fatal error: Uncaught Error: Class 'XenWord\Admin\Links' not found in /var/www/html/wp-content/plugins/xenword-2017.10.23/xenword.php:46 Stack trace: #0 /var/www/html/wp-content/plugins/xenword-2017.10.23/xenword.php(144): XenWordPro->init() #1 /var/www/html/wp-admin/includes/plugin.php(1882): include('/var/www/html/w...') #2 /var/www/html/wp-admin/plugins.php(164): plugin_sandbox_scrape('xenword-2017.10...') #3 {main} thrown in /var/www/html/wp-content/plugins/xenword-2017.10.23/xenword.php on line 46