Bottom Exit Latch Replacement - (For Torque Windows):

Open the exit window.  Using a suitable screwdriver, remove the screw holding the latch assembly together.  Unless you are replacing all parts in the assembly, keep all parts other than the broken latch.  Put the new latch assembly together in this sequence (outside to inside):

1. Round head nut
2. Flat washer
3. Through the hole in the frame
4. Plastic stop spacer
5. Wave washer
6. New latch (be sure it is the correct one.
7. Screw, re-tighten the screw

If necessary, replace the latch on the other side of the window.  Test latch action by closing and latching and re-opening the window.