1 Correct answer
Flash Player does not prompt for a password. During the installation process, the operating system displays a password prompt, because you need to give the installer permission to write files to system locations. It's the same password that you use to log into the computer.
If not, something really strange is happening. A screenshot would be super helpful.
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Replies
Thank you for the info.
Le 24/03/15, Jeromie Clark <forums_noreply@adobe.com> a écrit
Thank you for the info.
As I wrote, I tried many things before going to search for a solution...this includes no password (and yes I know that capital letters can stop me from accessing and downloading).
You are right, I don't need a password when I log to my own computer...but that i snot my problem. My problem is that Adobe flashplayer asked a password...that I forgot.
I don't remember my password, therefore I cannot type the password carefully! :-0
Nevertheless, I found a good way to install flashplayer without any problem. My friend tried it as he had the same problem...everything is good now.
Good success to you 
SOLUTION TO INSTALL FLASHPLAYER WITHOUT PASSWORD! created by Jeromie Clark(https://forums.adobe.com/people/Jeromie+Clark) in Using Flash Player - View the full discussion(https://forums.adobe.com/message/7340282#7340282)
You shouldn't have to disable disk encryption (file vault) to install Flash Player.
The following instructions work for most people:
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:
http://support.apple.com/kb/PH18653
http://support.apple.com/kb/PH14325
http://support.apple.com/en-us/HT201240
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