Place the .esp file in this file:

C:\Program Files (x86)\Steam\steamapps\common\Skyrim\Data

Load up the launcher and click on Data Files. If the .esp file appears checked on the list (check bottom of load order, unless you used a load order sorter after installing) then you're good.

The spell tome is located in the abandoned room in the Dragonsreach servant quarters (kitchen basement). Just outside the door to where you're supposed to do a Deadric quest.

Then enjoy, you sadistic bastard.