I've tried and managed to the installation, and even complete it to the point where it asks me to "reopen all browsers" or something along those line. And then nothing happens anymore. Restarting programmes or the entire computer won't make a difference. I've tried this dozens of times now for days and it's so frustrating!
I have a Mac Book Pro, mac OS X Version 10.5.8 and have been downloading the accurate version of Flash.