Download the slum565. You have the .lib inside.
1) Open the OrCAD's Model Editor : type "modeled" in the "run" of Windows and press enter.
2) Click on the icon "Open library"
3) Select the .lib from the slum565 folder
4) Left click the model once it has been charged in the "model editor". The model's parameters will be displayed.
5) File -> Export to Capture Part library. Click OK in the next window in order to create the ".olb"
--CONTINUE THIS STEPS IF NO WARNINGS ARE SHOWN--
6) Open your project
7) When placing a part, add a new library. Add your ".olb"
8) Inside PSpice, go the the Model Editor tab -> "library" folder -> (right click) add file -> add your ".lib" -> "Schematic library" when they ask for it.
9) Copy the ".lib" file you just added and paste it into the "model libraries" folder under the PSpice resources.
10) DONE.