Click on the related link to the OpenOffice website - and choose 'I want to download OpenOffice'. It will download the program to a folder on your desktop. Just double-click the folder to begin installations.

Install your OpenOffice.org package from the package installer (through the RedHat network).If open office is a .org package then you need to install the wine package according to the Linux version you are using,then you can install and run all types of .org packages using the wine application in the Linux OS.

Yes. OpenOffice is perfectly legal.

ALWAYS download from their official web-site. Simply choose the 'I want to download openoffice' option from the menu list, and follow the prompts. Their website is available through the related link if you need it.

Yes. OpenOffice should be available in the repository for Linux, and is available on OpenOffice's website for Windows.