yes, auto update won’t work if you have HMWP version like 4.511 or 4.521. You’ll need to follow the steps as mentioned above by ibergag. Also you can opt for manual update.
– first goto HMWP > Start tab and do “Export current settings” – save it somewhere.
– download latest HMWP version, and delete hide_my_wp plugin folder from /wp-content/plugins/ directory.
– using FTP/cpanel upload latest hide_my_wp plugin folder to /wp-content/plugins/ directory.
– goto website backend and activate HMWP plugin.
– goto HMWP > Start tab and import settings (from previously saved settings)