Actually Ewald, the best way to install OpenOffice in 5.9 would be to look under your XFCE menu for "GSlapt". When you press that you'll be asked for the root password. Enter that and GSlapt package manager will come up.
Once up and running go to "Edit>Preferences>Sources" and make sure the "Extra" repo of 5.9 VectorLinux is enabled. Press the "OK" button and press "update". Then simply scroll down through the list until you find "OpenOffice.org". Select it and press "execute". Depending upon your connection have a coffee or whatever as it does take a bit to download and install.
When finished---Bob's your uncle!---you'll have OpenOffice 3.0, the newest and greatest! And free of charge. Isn't life wonderful?!
I hope that helped my friend?
EDIT #1: How could I have allowed this to slip? Welcome to the VectorLinux Forum & Family Ewald!