Open the Components panel (View > Panels > Components).
When the built-in search doesn't have the specific SPICE model you need, these external repositories are industry favorites: Simulation Generic Components - Altium altium simulation library download
Use the filter to select to narrow down results. Open the Components panel (View > Panels > Components)
The most efficient way to download parts with simulation models is directly within Altium using the panel. altium simulation library download