If, for whatever reason, you want to uninstall HikaShop Widgetkit plugin, it can be easily done by following the below steps.
1) Go to Extensions > Extension manager.
2) Click manage on the left side of the screen.
3) Search for "Widgetkit HikaShop".
4) Select the Widgetkit HikaShop plugin.
5) Click the uninstall button on top of the screen.
And uninstallation is done!