The last OpenOffice version supporting Mac OS X 10.4 (Tiger), 10.5 (Leopard), 10.6 (Snow Leopard) is OpenOffice 4.0.1. Hardware Requirements CPU: Intel Processor. I am also unable to use Libreoffice since upgrading to the Catalina OS The following is the exact wording of a screen shot of the message received: 'LibreOffice' can't be opened because Apple cannot check it for malicious software. I got no Mac OS X, but there seems also to be some setting in Mac OS X's security preferences (as per internet.

macOS
First check the system requirements before installing LibreOffice on macOS.
Libreoffice Free Download
- Download the .DMG file from the download page.
- Open the .DMG file by double-clicking on it.
- An installation window appears: drag and drop the LibreOffice icon onto the Applications icon in the same window. You may be required to enter your administrator password.
- The files are copied over and a progress bar shows when the installation is complete.
- If needed, you may now download and install the language pack(s) of your choice and built-in help by downloading the .DMG file of your choice. The installers for these are launched from inside their .DMG files.

