Read before installing Office 2019 for Mac
On running the installer, you might receive a pop-up message saying that it “can't be opened because it is from an unidentified developer” or “can't be opened because the file is corrupt”.
To address this problem, please follow the following instructions.
To continue the installation process, you must authorize the installation.
There are two ways to allow installation. The first option is to allow it temporarily (recommended), and the second option is to change the setting of the whole system and restore it to default after the installation.
Please make sure that you check the procedure above before starting to download Office 2019 for Mac from the Software Distribution and Management System.
If you have any problems concerning the installer screen, please check this manual.