Proteus will show the I2C debugger logging 0x5A requests. If you get 0xFF or 0x00 responses, check that the MLX90614.HEX file is in the same directory as your .DSN project file (Proteus sometimes requires a local copy of the HEX file for simulation).
A real MLX90614 arrived from DigiKey. He wired it to an Arduino Nano, not Proteus. He wrote a quick sketch. The sensor saw his finger from 10cm: 34.2°C. His coffee: 68.5°C. The window: 12.1°C. Real. Perfect. Alive. mlx90614 proteus library
Since Proteus does not include every specialized sensor by default, you must manually add the library files to the software's directory. Proteus will show the I2C debugger logging 0x5A requests