The installation directory depends entirely on your version of Proteus.
Double-click the component from the results to add it to your devices list. Quick Circuit Setup Tips
To test if your newly installed model is working perfectly, set up a basic buck converter test bench:
Relaunch Proteus to let the software index the newly added component. 💡 How to Use the LM2596 in Your Simulation
You do not have to create the component schematic and PCB package from scratch. 🔍 How to Find the LM2596 Proteus Library Download