Error when attempting upgrade from HK Business 2.6.0 to 3.2.2

-- HikaShop version -- : Business 2.6.0
-- Joomla version -- : 3.8.3
-- PHP version -- : 5.6.33
-- Browser(s) name and version -- : Chrome 63.0.3239.132
-- Error-message(debug-mod must be tuned on) -- : Warning
Duplicate entry '1-1-Products-*' for key 'idx_client_id_parent_id_alias_language'

I receive the following error when attempting to update my software:
After the failure, Hikashop is no longer available on the Components menu. If I attempt to re-install rather than update, the menu item returns but the old software version remains.

Hi,

There is no index named "idx_client_id_parent_id_alias_language" in HikaShop.
I suppose that the index was added by someone.
On which page (URL ?) do you get that warning ?

Try this:
rename the folders administrator/components/components and components/com_hikashop via FTP, install the install package of the latest version, and then, in the HikaShop configuration, click on the "check database" button.

Thanks for your input. That got me going.