Locate the ARDUINO.UPD file from the update pack. Copy ARDUINO.IDX and ARDUINO.LIB to your C:\ProgramData\Labcenter Electronics\Proteus 8 Professional\LIBRARY\ folder.
| Tool | Legal Free Version | Capabilities | |------|--------------------|---------------| | | Proteus 8.9 Demo | Limited simulation; saves disabled; smaller circuits. No commercial use. | | Arduino IDE | Open Source (1.8.19) | Fully functional for coding and uploading to real hardware. | Proteus 8.9 Sp2 Professional With Arduino 1.8 UPD Free