This is what I do to be able to run more than one account on the same pc at the same time.
Locate your ED folder in C:\Program Files (x86)\Frontier and copy to a temporary location.
Open the folder and launch the launcher, Select options and (If not already) Log out machine.
Move the folder to it’s final location, Rename folder, open the launcher and log in as you normally would, ensure to select remember password , Verify and create a new shortcut.
To run both simultaneously, Log in one account, close the launcher and log in the other.
Play with settings to find your computers optimal running conditions.
I run 4 comfortably at 1024 x 720 windowed with the lowest setting possible.
Wait what? You run 4 copies at the same time? Why?