7
I also have FatCow. At first I thought it was the host. MySQL Database looked like it didn't work. There was no error. At the very first pass it would come back and ask to input info again.
SOLUTION:
Not a good one but it worked.

Download 2.3.3b

Downlaod 2.0.18.2 (
http://sourceforge.net/projects/xoops/files/) which is a
Stable Release
Extract htdocs from 2.0.18.2 - DON'T INSTALL yet

Extract files/folders specified for
upgrade from 2.3.3b

Upload htdocs content to the XOOPS
root folder.

Go to the website and you will be promoted to install Xoops

Complete the set up and click to view your site. No need to login.

On the address bar, at the end after
/ type: upgrade
Example:
http//subdomain.yourdomain.com/upgrade
Log in if prompted and follow instructions displayed.

Delete install and upgrade folders, and set read only permissions for mainfile

Log in to the administration section of your XOOPS website and go to modules

Update the System module.
That worked for me.