Since Flash Player is a FREE program I was not aware it needed a password Adobe Flash Player Install for all versions
Or do you mean your COMPUTER password?
When you are installing or updating, that is MOST LIKELY your computer operating system asking you to prove that you have permission by asking for your COMPUTER password, not your Adobe password https://forums.adobe.com/thread/2139902
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:
If you're trying to install Flash Player and are being prompted for a password, this is the operating system, not Flash Player, prompting for the password and it's not your Adobe ID password, but the password you use to log into your system (if you have one). Please see the FAQ What userid & password do I need to install Flash Player? for assistance.