Documentation/AOO4 User Guides/Getting Started/Introducing Apache OpenOffice/How to Get and Install the Software
From Apache OpenOffice Wiki
== How to Get and Install the Software ==
You can download the installation package (approximately 150 MB) from the project’s website, [https://www.openoffice.org/download/index.html https://www.openoffice.org/download/index.html]. The download process automatically redirects to a SourceForge web page which starts the download without the need to take any action on that page.
To install Apache OpenOffice, follow the same procedure that you used to install other software.