Is it a PPC or Intel Mac?
Flash player 11.1 hack on PowerPC - https://discussions.apple.com/thread/3558589?answerId=16990862022#16990862022
Might be later ones around also... saw 11.3 I think.
(If you are running a PPC Mac with Flash Player 10.1.102.64 and are having problems with watching videos on FaceBook or other sites, contributor Texas Mac Man suggests the following solution which fools the site into thinking that you are running the latest version:)
Download this http://www.steelbin.com/FPforFBPPC.zip to your desktop, unzip it, and replace the current Flash Player plug-in which is in your main/Library/Internet Plug-Ins folder, (not the user Library). Save the old one just in case this one doesn't work.
You should also consider the Shockwave Player, which displays Web content that has been created by Adobe Director, much used for multimedia: For PPC Macs: http://get.adobe.com/shockwave/
See in each Browser which version of Flash it thinks it has...
http://kb2.adobe.com/cps/155/tn_15507.html
But Flash has been pren to be the worst for security. 😟