PLG_CONTENTOVERRIDE requires COM_HIKASHOP v.1.5.8

on my test site i had upgraded to 1.5.8 business when it was released. wanted to try per product shipping and found in forum that first release was missing that plug-in and dwonloaded later release.

after installing, i now cannot access hikashop!

error is:

4711 - An error has occurred.
PLG_CONTENTOVERRIDE requires COM_HIKASHOP v.1.5.8

Return to Control Panel

I tried reinstalling, that did not help...

BTW...I do have a back-up, but it is not quite current so I would like to avoid using if possible....