The door to Don Copal's office is locked and Eva doesn't let you in.
There must be another way in.
Maybe outside. ?
Go down with the big elevator and out of the large doors.
Now, try to find the way back up. ?
Walk into the narrow alley. There's a rope hanging you can climb up.
After climbing up the rope at the alley you can now enter Don's office through the window.
You could mess with his computer.
Tried Don's computer