The SMP client runs alongside the main client...which you will need installed in order for the SMP client to run.
The best thing to do, however, is to use
MathGuy's excellent Service Installer to handle the multi-cpu machine (and the single CPU machine too!), and if you wish, you can do what some do, and run it in true idle (using the switch -x) and run it alongside D²OL, so when D²OL goes dry, it will run SoB, and when D²OL comes back, it will take over, and SoB will calm down, if you so wish!
All the instructions on how to install/set it up are in the zip file
Welcome to the TeAm, by the way!
Confused