Yes, silly thing they still say you need to Upgrade when we can't.
The last really supported Flash for PPC was 10.1.102.64, but if it's for like Facebook or such, people have been fooling FB to think they have a leter version installed.
Texas Mac Man's Flash hack/post...
Flash player 11.1 hack on PowerPC - https://discussions.apple.com/message/16990862
I think there's even a hack for v11.3 somewhere here.
See in each Browser which version of Flash it thinks it has...