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Here: https://currency-switcher.com/

100% you are trying to install Codecanyon bundle. To install the plugin you are need unpack its bundle downloaded from Codecanyon and then you will find inside woocommerce-currency-switcher.zip which should be installed.

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Uninstall free version of the plugin before installing premium version. All options are in the data base of the site – so all will be ok with there …