Why can't i download Unity Web Player?

Hello. I have recently been trying to play “Fly like a bird 3”. When I click the button to download Unity, it gives me an option to run or save. If I click either of the options, it immediately says Internet Explorer has stopped wotking, and closes all tabs. I could use some help! Thanks!

Go to Unity Real-Time Development Platform | 3D, 2D, VR & AR Engine and download the installer. Close IE and then run the installer. Once it has installed, open IE and continue.