And why did you not mention that in your fisrst post....?
Is there a way to clean all and preserve my data?
You can do some fixes for the current problem but it will not be a clean install anymore as the database tables are altered for the new release, so there is no clean way back.
rm -f /usr/local/ispconfig/server/plugins-available/backup_plugin.inc.php
rm -f /usr/local/ispconfig/server/plugins-enabled/backup_plugin.inc.php
rm -f /usr/local/ispconfig/server/plugins-available/aps_plugin.inc.php
rm -f /usr/local/ispconfig/server/plugins-enabled/aps_plugin.inc.php
rm -f /usr/local/ispconfig/server/temp/.ispconfig_lock