Since v6.15, The buttons on the registration dialog to buy / extend or renew licenses are unstyled and can even lead to being invisible on some OS: <img width="1029" height="322" alt="Image" src="https://github.com/user-attachments/assets/46d03a5f-adee-4564-8ac7-cf40d196adfa" /> on MacOS: <img width="1121" height="330" alt="Image" src="https://github.com/user-attachments/assets/63812691-1bd2-48e0-9f1e-22b2d0dbfcd9" />
Since v6.15, The buttons on the registration dialog to buy / extend or renew licenses are unstyled and can even lead to being invisible on some OS:
on MacOS: