Head back to the Bunker and talk with Clara. After the scene, leave the Bunker and head to Kenny's last signal location. When you reach the area, you'll discover that some fixers are already inside the area. Eliminate them and connect Clara to the computer.
After getting it online, more fixers will arrive. You have to defend the area until the data retrieval is complete. Keep moving from cover to cover since these enemies can use grenades against you. After retrieving all the data, wipe out Kenny's drive. The fixers will lock unto his location so find a vehicle and chase after them.
The enemies are using a fire engine and it will be a challenge trying to force them off the road with your puny vehicle. You can use the environmental objects or just let them weave through the traffic until they get slowed down, enough for you to use your grenade launcher or explosives. The mission will be complete after killing the fixer. The police will also be on your tail shortly after so find a fast, stable vehicle and make your escape.