does not work

Hello, I bought your plugin. So I deleted the old plugin and replace with the premium version. But it does not work anymore.

I had this code in the function.php

add_action( ‘wp_head’, function () {
$lang = get_locale();
if ( class_exists( ‘WOOMULTI_CURRENCY_F_Data’ ) ) {
$wmc = WOOMULTI_CURRENCY_F_Data::get_ins();
switch ( $lang ) {
case ‘de_DE’:
$wmc->set_current_currency( ‘EUR’ );
break;
case ‘nl_NL’:
$wmc->set_current_currency( ‘EUR’ );
break;
case ‘en_gb’:
$wmc->set_current_currency( ‘GBP’ );
break;
case ‘it_IT’:
$wmc->set_current_currency( ‘EUR’ );
break;
}
}
} );