Hi,
Please provide a screenshot of your joomla "system" plugins using the filter "hikashop".
The plugin codename is "hikashopproducttag" it is possible that during the installation, the name is not right copied so you couldn't find it using the keyword "microdata".
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.