I cannot upgrade my Adobe Flasher because I can't remember my password.
As far as I know, Adobe Flash doesn't need a password to upgrade because it's a free product globally available for all users. If you're using another application that resembles the name of Adobe Flash, then contact the developer of that application or consult the available Help sections.
To upgrade the Adobe Flash in your PC, use the following link: https://get.adobe.com/flashplayer/otherversions/