Now with your link I finally found it.
Thanks a lot.
Yesterday I only found the links to upgrade from 2.0.18.1 to 2.0.18.2
At sourceforge its easy to lose the overview of whats there, because the page is like a labyrinth, a maze.
Is your XOOPS_ROOT_PATH and XOOPS_URL in mainfile.php correct?
if not, the files from htdocs should be there
/home/USER_NAME/public_html/index.php
Did you make a copy of an installed site? Then there are the same tasks to perform as for a local copy.