Encrypt Local Backup change password incorrect password

So after installing iTunes from the Microsoft Store for Windows. I am trying to downgrade from iOS 13 to iOS 12.4.1 the most recent iOS versions.

I have followed the steps from downloading the iOS version from ipsw.me and changing the Info .PLIST file version from iOS 13 to iOS 12.4.1 in the text editor.

After saving the text editor and closing it out. I then went to iTunes and into my iPhone summary page and shift + left click "Restore iPhone..."

In order to completely restore my iPhone back to iOS 12.4.1 without loosing my data, I have to know what my Encrypt local backup password is and the problem is that I don't. I know what my iCloud password is as well my passcode to unlock my iPhone and all of my email's password so I don't know how to resolve this issue because I did the following to Reset All Settings and this did not help at all either.

I am at lost here. Changing the Encrypt local backup password is what I need to do in order to successfully restore back to iOS 12.4.1 without loosing my current data from iOS 13.

Any help would be much appreciated!