Can't re-install Premiere Elements 11

[Mark-West]

I have an old Premiere Elements project that I need to open in that program. (Premiere Pro says it can't open it because there is some problem.)  When I try to re-install Elements, it will not accept my user name/password. I have the password as 6 groups of four digits each, separated by dashes. I'm certain it is correct, and I have tried entering it with and without the dashes. As for user name, I've tried my first name, first and last names, initials. Nothing works. Any suggestons would be apreciated!

[John T Smith]

What you are calling password is a serial number, and it may be correct (do NOT post a serial number in a public forum)

When you are installing or updating on a Mac, that is your Mac asking you to prove that you have permission by asking for your COMPUTER password, not your Adobe password