[moved] Where to find PSpice simulation model files for Altium Designer?

'm using Altium Designer 16.0

I'm quite new to Altium Designer. First, I learned schematic and PCB design basics. Now I'm trying to simulate my electronics circuits which contains integrated circuits

I've been searching on the net to find out how to do simulation in Altium Designer. I found some tutorial pages in its official website:
Component, Model and Library Concepts
Linking a Simulation Model to a Schematic Component
Defining & running Circuit Simulation analyses

These tutorials tell me that I need ".mdl" or ".ckt" simulation model files to do simulation. There is no simulation model file in the "\Library" directory. There isn't any model files for even simplest integrated circuits.

So, where can I obtain these files?
Or, are these files hidden somewhere inside installation directory?
Do I have to find a simulation model file for every single circuit element??

thanks