Unable to simulate MP2636GR-P

I have copied the schematic given in the datasheet now I would like to simulate it.
I have tried adding .lib file which I downloaded through componentsearchengine site through the simulation model option in symbol properties.
I have checked the pin assignments over there it shows not connected for all pins
in the code section, it just says IC1 and nothing more
I need help to simulate this particular model what steps would you suggest to me.
During error check it says error loading simulation model
.lib file is stored in the same place as project is saved

KiCad does not have simulation models for complex ICs like this.
I doubt closed source simulators like LTSpice do either