Download button not showing

Hi

im using elementor and astra theme and of course woocommerce. i was reading some post in the forums to se if i can solve it myself but without resuts.
i added the custom code :

add_filter( ‘somdn_product_page_content_woo’, ‘somdn_product_page_content_woo_custom’ );
function somdn_product_page_content_woo_custom() {
// Return a different WooCommerce product page hook
return ‘woocommerce_simple_add_to_cart’;

}
but is not working. the button add to cart is still showing instead of download now.
i use also woocommerce membership and subscription. i seleected the right settings i think : ( Include selected memberships only , Include paid items that have 100% discounts for members).
and in membership plans i selected the las option (Allow Free Downloads for these members ).
i think its the theme. please i need help asap as we have a launch date. i can give credential to get in admin panel and also theme files. thank you in advance.

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