FIRST STEP : Backup your database !

Then :

• backup your old installation
• decompress your new wiclear tarball on your server
• copy your old configuration file (conf/config.ini) into your fresh installation of wiclear
• open a browser pointing to the install directory (e.g : http://server/wiclear/install)
• follow the directives

Example :

$> cd path-to-wiclear
$> cd ..
$> mv wiclear wiclear-old
$> tar xvzf wiclear-0.7.tgz
$> cp wiclear-old/conf/config.ini wiclear/conf
$> firefox http://server/wiclear/install