You do not have to create the component schematic and PCB package from scratch. 🔍 How to Find the LM2596 Proteus Library Download
If you had Proteus open during this process, close it completely. Lm2596 Proteus Library Download
: Use LM2576 from Proteus built-in POWER library. It's nearly identical to LM2596 (only difference is switching frequency). Then modify your circuit accordingly. You do not have to create the component