I don't use a password to log in to my Mac, and to my knowledge, I don't have one. I'm the only one who uses it.
When I try to install Adobe Flash Player Installer, I need that password.That I don't have. I need the Flash Player. Now what?
You'll need to set one up. I used no password on my MBP when I first got it, and I had to change it to have one EVERY TIME I updated software. OS X WILL NOT allow you to install or update software without a password. That's NOT an Adobe thing.
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