Flash Player - Downloads:
http://www.adobe.com/products/flashplayer/distribution3.html

Flash Player - Downloads for Internet Explorer / Windows 8.x:
http://helpx.adobe.com/flash-player/kb/flash-player-issues-windows-8.html#main-pars_header_0

Uninstall Flash Player | Windows:
http://helpx.adobe.com/en/flash-player/kb/uninstall-flash-player-windows.html
http://download.macromedia.com/get/flashplayer/current/support/uninstall_flash_player.exe ⇐ direct download

Flash Player FAQ:
http://www.adobe.com/products/flashplayer/faq.html

Note: Please be aware of any pre-checked optional downloads when updating. Flash Player will run properly without them.