The following error has been displayed on plugin activation after updating to the last version.
Database error of WordPress Duplicate column name 'msgfrom' in the query ALTER TABLE {my_prefix}_wplc_chat_msgs CHANGE 'from' 'msgfrom' varchar(150) triggered by activate_plugin, do_action('activate_wp-live-chat-support/wp-live-chat-support.php'), call_user_func_array, wplc_activate, wplc_handle_db