If you run into persistent errors, fall back to converting a fresh SPICE model from ON Semiconductor. It requires a bit more effort, but guarantees accuracy.
This is the most reliable source for high-quality symbols, footprints, and 3D models. You can search for the MC1496 on SnapMagic to download files specifically formatted for Proteus. The Engineering Projects (TEP): mc1496 proteus library download
The library only contains schematic symbols, not the mathematical simulation data. If you run into persistent errors, fall back
C:\Users\[Your_Username]\AppData\Local\VirtualStore\Program Files\Labcenter Electronics\ If you run into persistent errors
Proteus can import SPICE models, though the process is not always straightforward.
C:\Program Files (x86)\Labcenter Electronics\Proteus 8 Professional\DATA\LIBRARY Step 3: Copy and Paste the Files