For pure simulation and learning, 8.9 SP2 is widely considered "the last great stable version."
: Locate the LIBRARY folder (usually in C:\ProgramData\Labcenter Electronics\Proteus 8 Professional\ ). Proteus 8.9 Sp2 Professional With Arduino 1.8 UPD Free
void loop() digitalWrite(13, HIGH); delay(1000); digitalWrite(13, LOW); delay(1000); Serial.println("Hello from Simulated Arduino"); For pure simulation and learning, 8