Switching your browser should solve the issue. Mozilla Firefox is what most people use for problems like these, and many have gone on without anymore complaints. I just wouldn't use Internet Explorer, though... rumours have been going around about a virus lurking around in it.
However, feral heart is completely virus-free, and once you switch browsers everything should be A-okay.
Sometimes you need to download Feral Heart on different browsers even if they worked before on the browser.