Always verify the footprint (e.g., LM2596S for SMD or LM2596T for through-hole) against the LM2596 Datasheet before ordering boards. simulation guide for an LM2596-based power supply? LM2596S-ADJ/HAPB - SnapMagic
: Paste both files into that LIBRARY folder. If Proteus is open, you must restart it to "invoke" the new component. Lm2596 Proteus Library Download
Run the simulation. You should see a stable DC output with ~50mV ripple. Always verify the footprint (e