Chris Andersen on "[Plugin: WooCommerce - excelling eCommerce] Problems after update from 1.6.5.2 to 2.0.5"

Got this error as soon I want to see the WP dashboard after update:

Fehlerausgabe / Error output:
Fehler beim Verarbeiten des Skript-Headers / Error parsing script headers:
WordPress-Datenbank-Fehler Multiple primary key defined für Abfrage ALTER TABLE iw_woocommerce_downloadable_product_permissions ADD PRIMARY KEY  (product_id,order_id,order_key,download_id) von require_once('wp-admin/admin.php'), do_action('admin_init'), call_user_func_array, Woocommerce->update, Woocommerce->install, do_install_woocommerce, woocommerce_tables_install, dbDelta

What am I doing wrong?

http://wordpress.org/extend/plugins/woocommerce/