Pro License allows for commercial use and enables additional features
(labeled with "Pro" in Settings).

• Allowed commercial/business use
• Option to change font (only fonts that have all character glyphs will work)
• Change file size format
• Change default file view
• Change folder thumbnail style
• Ability to open PowerShell or Terminal in current folder (Context Menu or F10)
• Choose which maps site to open when clicking Location of a previewed photo
• Ability to exclude certain extensions from showing thumbnails
• Editable list of extensions to show text excerpts in Adaptive and Thumbs+Details view
• Editable list of file names, prefixes, and extensions to hide from view
• Changeable number of lines in text excerpts in Adaptive view (show excerpts of .js, .css, .py and similar in file list)
• Ability to exclude Shell Context Menu items
• Change naming format for creating email files (dropped from Outlook)
• Run custom scripts on files in File Automator
• Ability to have more than 8 scripts in the Scripts menu
• Ability to create Symlinks and Hard Links
• Editable command to download video and audio files from website by pasting the YT link
• Editable list of file types for preview pane association
• Unlocks any future Pro features

Since the license are of "Lifetime" type, price increases won't affect existing license holders.