Explanation/Reference:
A: To manually download the software and install onto the device:
1. Navigate to the Palo Alto Networks Support Portal on a web browser.
2. Go to the Software Updates page and download the appropriate PAN-OS release for your device.
3. On the WebUI of the device, navigate to Device > Software and click "Upload." Browse to locate the downloaded software package, then click OK to upload the file to the device.
4. Click "Install from File" and select the uploaded file.
5. Click OK to initiate the upgrade.
CF: How to Upgrade PAN-OS on a Palo Alto Networks Device
Steps
1. From the WebGUI, go to Device > Software, or on Panorama, Panorama > Software on the left pane to open the software page.
2. In the lower left corner, click "Check Now" to update the list of latest software releases available from Palo Alto Networks.
3. Download and install the new release. Refer to the Base Version Note below about base versions.
1. To install a new release from the download site:
2. Click Download next to the release to be installed. When the download is complete, a check mark is displayed in the Downloaded column.
3. Click Install next to the release to initiate the installation. During installation, an option is available to have the device automatically reboot when installation is complete.
4. When the installation is complete, a prompt displays to restart the device.
References: https://live.paloaltonetworks.com/t5/Management-Articles/How-to-Upgrade-PAN-OS-on-a- Palo-Alto-Networks-Device/ta-p/53648
https://live.paloaltonetworks.com/t5/Configuration-Articles/How-to-Install-Software-Image-that-was- Pushed-from-Panorama/ta-p/56713