There is a way to start from scratch, but keep your current database and update your forum at the same time. If you have any Mods installed, this *will* remove them.
Backup all your forum files
Go into the Admin Panel and set the style to subSilver
Download the Full Package 2.0.20 from this site
Delete all the files in your forum folder *except* config.php
Upload the Full Package 2.0.20 *except* for the config.php
Point your browser to:
http://www.yoursite.com/forum/install/u ... latest.php
***Note: Replace yoursite.com and forum with your stuff
Delete the /install and /contrib
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