Thanks for reply. I tried Altium designer too, but it seems doesn't have FT232R simulation model file too.
What simulator should i use? I have a project with the final circuit like this: https://chetanpatil.info/1/post/2012/03/interfacing-usb-lcd-8051.html
I'm really grateful helping me doing this project.
I don't know what you want to achieve with simulation in this case.
Regarding the said link, jayanth already stated that the circuit can't work as shown.
It's not even clear what's the intended pupose of USB interface in this case. Apparently the author has only vague ideas about USB, e.g. when he mentions communication with USB sticks, which actually requires an USB hist interface.
I didn't expect that you are referring to VUSB or a similar solution. It's limited to low speed USB. It surely can't work with standard 8051 that is working at 1 MIPS only. And it rarely can be simulated with Proteus.