Loosen and remove the two retaining screws from the lock faceplate on the interior side of the door with a Phillips screwdriver.
Slide both halves of the lock from each side of the door and remove them.
Remove the screws from the latch faceplate on the edge of the door with a Phillips screwdriver.
Pull the latch straight out of the edge of the door,
Measure the width of the door the deadbolt is to be installed in with a measuring tape. Press the button on the latch assembly of the deadbolt while pushing or pulling the latch housing to the correct preset position to match the width of the door. Skip this step if the deadbolt you will be installing is not adjustable.
Push the latch assembly into the mounting hole in the edge of your door. Ensure the faceplate of the latch is flush with the edge of the door. Thread the two retaining screws through the mounting holes in the faceplate and tighten them with a Phillips screwdriver.
Grasp the lock cylinder so that the name on the exterior face of the lock is facing upwards. Note that when you insert the key into the cylinder the flat side should be facing downwards and the serrated edge facing upwards. Insert the tailpiece of the cylinder through the hole in the latch assembly until the lock is flush with the surface of the exterior of the door.
Slide the turn knob onto the lock cylinder tailpiece from the interior surface of the door. Hold both halves of the lock together until you have installed the screws.
Thread the two long screws through the mounting holes in the faceplate of the turn knob. Tighten the screws with a Phillips screwdriver to secure both halves of the lock together.