Repeated: Limit maximum quantity to the stock value

Hi @sebastianrybacki, repeating the question from @sinirii, because the answer provided on the forum few months ago does not work? So again… Is there a way to limit the maximum quantity to the current stock value?

As you wrote, this functionality is enabled in the Pro version of the plugin and we have purchased the Pro version, but this does not work at all?

…”However, please note that?this feature is only available in the PRO version?of our plugin. If you are currently using the free version, this functionality is not accessible. We encourage you to upgrade to the PRO version to take advantage of this and many other advanced features.”…

Try with this product:
https://silvernity.de/shop/hochwertige-ketten-aus-960er-argentium-silber/elegante-venezianer-kette-aus-960er-argentium-silber-10-mm-breite-wunschmass/

As you can see on product, stock quantity is set to 60 cm, but it is still possible to add to cart any quantity regardless of the limit?

Please check, thanks in advance.

BR Mario

The page I need help with: [log in to see the link]