the "Khmer OS Font Family" (includes Khmer OS Muol, Khmer OS Content, etc.).
This method is 100% free and requires no third-party downloads. khmer typing free download for pc
For most users, the built-in Windows settings are the safest and easiest way to get Khmer typing without downloading third-party installers. However, if you specifically need the NiDA layout, you will need to download the installer. the "Khmer OS Font Family" (includes Khmer OS