It's not an Adobe password, and it's not Adobe that requires it. It's your OS X system admin password and OS X requires it to install anything.
I've tried several passwords and none have worked.
The password prompt is supplied by the operating system, and is intended to protect you from accidentally installing software. You will get this prompt for any installation outside the App Store context.
If you do not need to enter a username or password when starting your computer, you can probably just leave the password field blank when acknowledging this prompt.
Thank you so much. I went back and tried it again and one of the passwords I had tried earlier and must have typed wrong, worked this time. So I’m good to go.