Q: When I tried to update PDF Studio to the latest version on macOS big Sur I received an “Invalid checksum” error message. Is there a way to fix this?

A: Recent macOS changes require applications to be notarized with a developer certificate before it can be installed. This process modifies the installer and so when the separate update tool tries run the checksum validation in our installer software to it fails because it no longer matches. We are currently working with our installer application to try and resolve this.

In the meantime please download the installer directly from our website below and make sure to choose the “Update existing installation” option.

www.qoppa.com/pdfstudio/download/