To install KMS Pico, first, ensure your antivirus software is temporarily disabled to prevent interference during installation. Extract the downloaded file and run the executable file as an administrator. Follow the on-screen instructions to complete the installation. After installation, you can open KMS Pico and follow the prompts to activate your Microsoft products. Remember to re-enable your antivirus software afterward. Be cautious, as improper use can harm your system or violate software agreements.