Hi,
you can download the general installer package. That will install the Open office in the /opt directory.
For the pro box with deb package is a file in the deb directory which describes how to integrate this disc for apt and to install it. I tried it several times without success and finally installed it manually package by package.
It is a little bit like a puzzle and it takes some time. But it works. If you want to do this open thunar in admin mode and enter the deb directory on the disk. Than start with double click on the deb package with "ure" at the end. Next choose the ooobasis3.1-core packages 01 to 07. Hereafter choose the general packages without language localisation and than with language localisation. At last install the desktop integration package in a seperate directory. If you get an error message about depency error than install the package mentioned after the error message as the next one.
Good luck
Squirrel (elive user)