To download and install KMS Pico, first, you need to find a trusted source that offers the tool. After downloading the software, extract the files using a tool like WinRAR or 7-Zip. Run the executable file as an administrator, and follow the on-screen instructions. The program should automatically activate your Microsoft products once installed. Always ensure that your antivirus is turned off during the installation process to avoid interference, but remember to turn it back on afterward.