Have you received a notification that have installed the certificate?
If the issue persists you can handle this with a combination of key presses.
The fastest and easiest way here is just to press TAB and Enter for example (or the right key combination which will click the second link):
Manager.Desktop.KeyBoard.KeyPress(System.Windows.Forms.Keys.Tab, 50, 1);
Manager.Desktop.KeyBoard.KeyPress(System.Windows.Forms.Keys.Enter, 50, 1);
Let me know if this helps.