Determine what you actually want to install. Most users looking for a "One UI APK" are seeking: The official Samsung launcher.
If the official APK won't run on your device, use these alternatives to get the One UI aesthetic: Download OneUI apk
Most One UI apps require a specific Android version (e.g., One UI 6.0 usually requires Android 14). Determine what you actually want to install
System apps are not available on the Google Play Store for non-Samsung devices. Use reputable mirror sites to ensure the files haven't been tampered with: Download OneUI apk
Individual apps like the Gallery, Weather, or Calendar.