From this page:
http://www.libreoffice.org/download
You can download LibreOffice for your system, and localization package, by
clicking directly on the title ("Main Installer" and "Translated User
Interface"). This will open a new page that will automatically start
downloading. Donating is not a requirement, and doesn't lead to any new
download, as mentionned by the large green writing.
If the download doesn't start automatically, you can click on the link
provided in the paragraph at the top of the page. It will read something
like this:
"Your download LibreOffice_4.2.1_Linux_x86-64_rpm.tar.gz should begin
shortly. Please click the link in case it doesn't start.
You can find the optional downloads on the right.".