Hey there @Narcissus24,
Thanks for keeping us in the loop.
Do you mind trying once again in a private/incognito window? This step makes sure you avoid issues with your browser's cache. If that doesn't do the trick try again in a different kind of browser.
However, keep in mind that different payment methods vary in availability across different countries. To see the payment methods available in your country, go to the student discount page and double-check which payment methods appear in the drop-down menu.
Hope this helps. Keep us posted.