Note: The article is relevant if you got PDF Expert on https://pdfexpert.com/. If you got PDF Expert from AppStore, just skip the message.
The current version of the developer signature certificate expires on August 30. After this date, macOS won’t run the current app version. To continue using PDF Expert flawlessly, please download and install the update if you haven't yet. Otherwise, the app won’t launch. We are sorry for the inconvenience. Please find the needed version of PDF Expert in the list below.
PDF Expert 3
If you have PDF Expert 3 installed - delete it from your Mac, then download it again on https://pdfexpert.com/ and sign in with an email address you used to purchase/subscribe to access the full version.
PDF Expert 2
If you have PDF Expert 2 installed, delete it from your Mac, then download it again using one of the links below (depending on the macOS version of your Mac) and activate your license to access the full version. You can find your license code using the License Retrieval tool.
If you'd like to upgrade to PDF Expert 3, which uncovers a multiplatform subscription with new features like Text recognition (OCR), scans enhancement tools, and export to other formats option, download the app from https://pdfexpert.com/. If you don't want to upgrade to PDF Expert 3, download the app here:
MacOS 10.13 or later