1. Proteus Installation Tutorial

Step 1 : Install Proteus

If you haven't install. Then Install, remember from DSD.

Step 2 : Download the Arduino Library for Proteus

Download from here : https://drive.google.com/file/d/1LMYOUn39nAZBdGL0SR3n30pf-fRXeP-B/view

Step 3 : Install the Library

Go to the System Settings in System Tab :

And then choose where you extract the downloaded folder :

Step 4 : Install Arduino IDE

Go and Install Arduino IDE from here : https://www.arduino.cc/en/software