You can find details on different license types (Standard vs. Professional) on the Hard Disk Sentinel Version Comparison page Professional : Includes advanced backup options and remote monitoring. : Focuses on core disk health and temperature monitoring. Recovering a Lost Key

: You can download a trial version that offers basic health checking functionality but will display registration reminders until a key is entered. Important Security Note

: After purchasing, you will receive an email with your registration key. You can then use this key to register your copy of Hard Disk Sentinel.