Once you have downloaded the library files (usually 4RELAY.LIB and 4RELAY.IDX ), follow these steps:
Omar hesitated. Downloading random files was risky. But the clock on the wall read 11:30 PM. Desperation won. He downloaded the zip file, extracted the contents, and copied the .LIB and .IDX files into the LABcenter Electronics\Proteus 8 Professional\LIBRARY folder. --- 4 Channel Relay Module Library For Proteus
One second later, the second channel lit up. Click. Once you have downloaded the library files (usually 4RELAY