Hi,
what must i do to update my 0.1-20060220 Version to the latest beta2 ? the Upgrade-Manual dont contain my Version
That must have been a snapshot (such as the ones put in FreeBSD's ports system)
You can usually get by with overwriting the files, check the new main.inc.php.dist for new settings, and either recreate the database, or run everything in SQL/mysql.update.sql - Although if it does not work properly after those updates you may need to recreate the database, or at the very least check the new DB creation script and see if your DB schema matches up with what it would create.
Check the Upgrading page on the Wiki -- the same general instructions should work for each case:
http://trac.roundcube.net/trac.cgi/wiki/Howto_Upgrade