You will need to reactivate the corresponding amount of windows to obtain your bonus prize.
For example, if you have 8 windows activated but would like the 4th Window Bonus Prize again, you will need to open 4 more windows to obtain it. You do not need to reactivate the exact same window to get the bonus prize again, though. Do note that to obtain the final bonus prize, you will need to activate all 16 unique windows again.