When trying to install CLIO Pocket 3 under macOS 15 Sequoia you might find yourself in this situation where you cannot proceed with the software installation:

In previous versions of macOS right+Click on the ClioPkt package used to lead to the same dialog, but a click on the button “Done” was sufficient to install the Clio Pocket software.

According to Apple documentation https://developer.apple.com/news/?id=saqachfa this solution is not longer viable:

“In macOS Sequoia, users will no longer be able to Control-click to override Gatekeeper when opening software that isn’t signed correctly or notarized. They’ll need to visit System Settings > Privacy & Security to review security information for software before allowing it to run.”

Our code is properly signed as per Apple’s requirements. Until now, notarization was not necessary for applications distributed outside the Apple marketplace. However, Apple is currently pushing developers to notarize their software as well. This process is time-consuming, and as a small company, we would prefer to avoid wasting resources on it.

To proceed with the installation of Clio Pocket you should also open System Settings and select the Privacy & Security section where you will find the following dialog:

A click on “Open Anyway” does the trick.