Here I wanted to update, which I now know was a mistake, be cause i get this error
/home/+++++/+++++_html/piwik/core/Updates/1.6-b1.php:
Error trying to execute the query ‘ALTER TABLE piwik_log_conversion_item
ADD idaction_category2 INTEGER(10) UNSIGNED NOT NULL AFTER idaction_category,
ADD idaction_category3 INTEGER(10) UNSIGNED NOT NULL,
ADD idaction_category4 INTEGER(10) UNSIGNED NOT NULL,
ADD idaction_category5 INTEGER(10) UNSIGNED NOT NULL’.
The error was: SQLSTATE[42S21]: Column already exists: 1060 Duplicate column name ‘idaction_category2’