Saves ProtonMail Emails & Mailbox Folders from Cloud to Local Desktop
Backup Single ProtonMail Account or Multiple ProtonMail User Accounts
Add Multiple Users Accounts in a CSV File to Load Data in Batch Mode
Advanced Use Proxy option to Connect ProtonMail Email Source using Proxy Server
Multiple Advanced Filters Settings to Download Selective ProtonMail Emails
Protects the Original on-disk System Hierarchy of ProtonMail Mailbox Folders
Preserve ProtonMail Emails Metadata & Properties During Backup Process
Several File Naming Settings Available to Change & Save Output Files
Download ProtonMail Emails with Normal & Embedded Attachments
Completely Independent ProtonMail Backup Tool for Windows OS Devices

Whats New:
Updates: official site does not provide any info about changes in this version.