Here's the author's latest comparison of the FREE vs. PREMIUM versions:
Free Edition features include:
New Folder Watch Protection
Submit Malicious Files
Improved Program Filtering Protection
Improved Malware SRP Protection
Expanded Malware Definitions (Optional)
Free Updates (Manual)
Premium Edition includes all Free Edition features, plus:
New HoneyPot Ransomware Protection
New KillEmAll v5 Integrations
New Tray Icon Features and Notifications
Customize Folder Watch Protections
Customize Prevention Rules
Email Notification Features
Automatic & Regular Updates