I haven't been able to install it successfully - tried over 40 times
It always gets to 40 or 80 percent, stalls, then goes directly to 100 and says success.
I believe that there is a beta version on their website, which is the one that you need to install.
I have no problem with Flash.
I installed Mavericks over Mountain Lion. I think, that is the reason why it works for me.Are you running on an external HD? I feel like that may be my problem
I have no problem updating Flash, currently 11.7.