Here are all 5 locations of the ED-E upgrades:

1.) Hopeville Silo Bunker - natural game progression, middle of hallway impossible to miss.

2.) Hopeville Missle Base HQ - under a desk in a room left of the entrance.

3.) Ashton Silo - Laucnch Decl level one, far room accessed by a terminal.

4.) After exiting Sunstone Tower - on the ground near three stone huts there is an exposed sewer tube, walkthrough up a top to the right.

5.) Same area after exiting Sunstone Tower - enter sewer grate to Municipal sewers accessed via 3rd street municipal building.

Receive ED-Ecated achievement/trophy. Working on all 20 RALPHIE poster locations. Only at 14/20 right now.

Cheers