--- 4 Channel Relay Module Library For Proteus [SIMPLE – REVIEW]

Modern Windows restricts writing to Program Files. If you extracted the library directly into the folder while Proteus was open, the file may be locked.

GitHub hosts several open-source Proteus libraries. --- 4 Channel Relay Module Library For Proteus

If you open Proteus 8 or Proteus 9 and search for "RELAY", you will find generic parts like RELAY or RLY-SPST. While these work for a single relay, they are problematic for a 4-channel module simulation: Modern Windows restricts writing to Program Files

Thus, you need a dedicated 4 Channel Relay Module Library. Thus, you need a dedicated 4 Channel Relay Module Library

Even with a perfect library, simulations fail. Here are the top 3 errors: