1.https://get.adobe.com/flashplayer/ , select tar.gz for other Linux, download
2.Unpack the tar.gz file, refer to the readme.txt
3.cd the unpacked dir, get the following files:
+ libflashplayer.so
+ /usr
4.Identify the location of the browser plugins directory:
+ Firefox about:plugins Path: /usr/lib/mozilla/plugins/xxx.so
+ Chrome about:plugins details /opt/google/chrome/xxx.so
5.copy the files:
+ cp libflashlayer.so <BrowserPluginsLocation>
+ sudo cp -r usr/* /usr
6.done