You can install the latest one manually. I tend to use the freshplayerplugin with the PPAPI version. But I limit my install to just one user and use firefox (iceweasel), plus jessie. Just bear in mind that manually doesn't update, so YOU need to keep on top of the security updates, which are often for flash.
For how I install that bit:
http://www.linuxquestions.org/questi...es-4175598945/
Post #10. It's not that complicated, except that I build freshplayer from sources, but skip the make install step. The end result of which is the placement of 4 files, one of which is a config file.
.mozilla/plugins/libfreshwrapper-flashplayer.so
.mozilla/flash/libpepflashplayer.so
.mozilla/flash/manifest.json
.config/freshwrapper.conf