If you downloaded your version directly from the PDF Expert website , ensure you are running the latest updates to avoid issues with macOS security certificates, which can occasionally prevent older builds from launching. How to Update To ensure you are on the latest build: How to add text to a PDF on Mac
Efficiency Redefined: What’s New in PDF Expert 2.5.6 (682) PDF Expert 2.5.6 (682)
Use highlighters, stamps, and audio notes to provide feedback exactly where it’s needed. If you downloaded your version directly from the