Hi Solange,
We’re sorry you've encountered problems installing Flash Player. Unfortunately, we've been unable to consistently reproduce this issue and we’re looking for a few volunteers to help us generate debug logs.
If you’d simply like to get Flash Player installed, please try downloading and installing from our “stand alone” installer located here: http://download.macromedia.com/pub/flashplayer/current/support/install_flash_player_osx.dmg. We suspect this simple step will resolve the majority of the problems that are being encountered.
If you’re up for helping us figure this out, and you don’t mind running commands from the Terminal application or looking for logs in the Console, please send an email to ccampbel@adobe.com with the title of this thread as the subject.
Thank you.
--
Maria