Your customers have to enable automate updates. You can recommend to your customers that they enable them, and link them to this article for instructions: https://www.wpbeginner.com/plugins/how-to-enable-automatic-updates-for-wordpress-plugins/

Great question, Claudia! You can restrict payment methods based on product types, which would make sense to do if your digital products are priced lower than the print books and you’d like to minimize fees to preserve your margins. You may need a separate plugin or be comfortable modifying the function.php post. Here’s a post that might help: https://passwordprotectwp.com/restrict-woocommerce-payment-methods-product-types/

I have an additional question: we do sell print books in the very same woocommerce store: how could I make sure, that ebook buyers need to pay via Paypal, whereas all the other printed products could be paid with bankwire / transfer later on?