Get it here or via 'Help > Check for Updates'.
Please ensure you have 'Auto-Save' and 'Backups' enabled in the Preferences
What's changed from 9.0.9:
- Fixed 'Custom Attribute' dialog allowing self-referential calculations
- Fixed 'Export Tasks > GanttProject'
- Changed 'HTML Comments > Insert Horizontal Line' keyboard shortcut to 'Ctrl+Alt+L'
- Added 'Ctrl+Alt+L' as keyboard shortcut for 'Rich Text Comments > Insert Horizontal Line'