I know it's not supported, and believe Windows 10 will not let it install. I don't know about earlier releases, but I'd bet 8.1 and 7 likely wouldn't let you install it either. Even if you get it installed somehow, you probably would run into a problem registering it, and that means you couldn't use it. You can download the free LibreOffice which is mostly compatible with Office and it's free.
Good luck.