Flash Player for Internet Explorer in WIndows 8 is integrated by Microsoft and you CANNOT download or install it from here. There's a Microsoft Windows Update KB patch on your machine that prevents it.
You must run Windows Update to update the Flash Player for Internet Explorer.
However, If you're using Internet Explorer 11, literally thousands of web pages can't recognize the browser, so they don't recognize any of the plugins, like Flash Player. So far, Microsoft has made NO indication that they have any plan to fix it soon.
Microsoft's recommendation is to use Compatibility View for affected pages, and "pretend" you're using an different browser. Trouble with that is it has seen limited success at best, and you have to individually enable it for EVERY page that has problems.
I'm not big on "pretending" so I recommend actually using another browser.
ANY of those will work where IE11 won't, with the Flash Player Plug-in (For all other browsers), and Chrome doesn't even need that because it has its own Flash Player plugin built in.