where can i download a version of libreoffice for Mac 10.9.5

mac mini 2.26 GHz intel core duo late 2009 with 10.9.5


as per system requirement document you should be fine with 6.2.8 from Download LibreOffice | LibreOffice - Free Office Suite - Based on OpenOffice - Compatible with Microsoft for macOS 10.9 (Mountain Lion)

Note: This answer ignores your tag macos10.8 and regards title and details only, which mention 10.9.

Hope that helps.