Bunkr is always finicky. If it's because of pop ups, quickly close it, get back to that tab of the video, and click play or download. Otherwise you'll get another pop up, and have to do it over again. If it's saying the page won't load, that could be on their end cause they always work on it.
Browser extensions are also very helpful. Adblockers of course, but I also use one called Popup Blocker (strict) which doesn't allow any sort of popups or redirects without permission.