Mac running the latest software. My Flash Player was out of date but every time I tried to update it I got stuck when I was asked for my password, which I'd forgotten and could find no record of. Finally found where to change it and put in a new one, which works fine to sign into the site but will not allow me to install the current FP. I suspect a problem with two user names, as the Adobe site has me with one name and FP with another. I can find no way to contact anyone at Adobe about this. Most grateful for any help since Adobe has blocked my FP and I can no longer run most video.
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: