KB44321 - "PulseSecure.pkg" can't be opened because Apple cannot check it for malicious software when installing Pulse Desktop Client installer (PKG file) on macOS 10.15.1 and above.

This article describes an issue where users receive a message prompt " 'PulseSecure.pkg' can't be opened because Apple cannot check it for malicious software" when installing Pulse Desktop Client installer (PKG file) on macOS 10.15.1 and above.

In the latest macOS 10.15.1 and above, Apple has enforced notarization. Due to this change, user will not be able to install the Pulse client by clicking on the .pkg file.

This is occurs due to Pulse Desktop Client 9.1.8.3999 and below is not properly notarized.  For more information, refer to Apple's Developer Portal updates at https://developer.apple.com/news/?id=09032019a.

To resolve this problem, upgrade to Pulse Desktop Client 9.1.9.4983 and above.  If upgrade is not possible, please refer to the workaround section below:

Workaround 1:

1. Double-click on the PKG file
2. Click OK

3. Navigate to Security & Privacy > General
4. Click Open Anyways

5. Click Open

Workaround 2:

1. Right click on the downloaded PKG file
2. Click Open With > Installer (default)

3.  Click Open