All videos have been blocked now for three days on my Mac OS 10.9. I have the box checked allowing Adobe to download updates but the message is the same: my flash player is outdated. Efforts to update have all failed. The download proceeds to the point where my password is requested, in order for Adobe to make a "change".But my password is not accepted. I've reset this password recently. It's accepted on Adobe's home page and on Adobe's ID page. Efforts to uninstall the flash player get the same shaky box treatment: password no good. I'm totally stuck.
I think I'll just let it be for a couple of days and they try again - maybe I'll get lucky on Christmas
The problem you posted was different from the original question posed in the thread. I've branched it out to it's own topic.
The following information should get you going:
This password prompt is presented by your operating system, and is intended to keep you from accidentally installing software.
If this is your personal machine and you don't need a password to log into the computer when it first starts up, you can probably leave the password blank and click OK to get past this prompt. If this is your personal machine and your normal password isn't working, check to make sure that CAPS LOCK is off, and type the password carefully.
If this is your work machine and it's asking for an Administrator password, well, you'll need to have a conversation with your friendly IT person.
If you're still stumped, you may need to reset the password on your Mac: