For commercial support around LibreOffice see our list of certified partners.
Selected: LibreOffice Windows, version 4.3.4, English (US)
You need to download and install these files in order:
A portable version of LibreOffice packaged in PortableApps.com Format, so you can take all your documents and everything you need to work from a USB, cloud or local drive. See PortableApps.com for more information.