Google stopped supporting adobe. so you need to install the flash manually

• http://helpx.adobe.com/flash-player/kb/installing-flash-player-android-devices.html
• https://forums.adobe.com/thread/1061194

hello, adobe has already discontinued any further development or support for flash on mobile devices a while ago in favour of html5 content: http://blogs.adobe.com/conversations/2011/11/flash-focus.html

you can still find old and unsecure versions under: http://helpx.adobe.com/flash-player/kb/archived-flash-player-versions.html

Also note that the old Flash 11.1.x Plugin from Adobe is only for phones/tablets with a ARMv7/ARMv6 cpu and not a Intel cpu which some more newer devices are using instead.