Thank you the 6.19.2 upragde work well.
However, the K2 plugin continues not to work and has not worked since the bug recovery process after the 6.18.3 faulty uprgrade.
It seems that during the process to recover from the failure of the 6.18.3 (ie deleting the acymailing folder then reinstalling the component. The plugin its shown as installed but it is not. So I cannot reinstall from the plugin library and when I try to delete the plugin it says it is not found. SoI am prevented from reinstalling the plugin. How can I delete it from the component?
