Problem with installation

We have NIS version 2.0 on our Mac. A renewal reminder came up. Tried to download, couldn't suss it, so went and bought a retail box with NIS 4.

I read the instructions and as it did not say anything about what to do if you already have NIS running, I just inserted the disc and installed. I restarted, but the Set Up Assistant has not come up. Help!

 

Thanks in advance to whoever replies!