A: Private trackers (like HDBits) dedicated to high-framerate content, but gaining membership is very difficult. For public use, downloading from YouTube using a 60FPS downloader is the safest method.
If you own a 24fps movie file legally (e.g., a MakeMKV rip of your own Blu-ray), you can use or DmitriRender . These are paid software ($20-30) that use AI motion interpolation to convert your 24fps file into a real-time 60fps playback. download link 60fps movies
You can find 60fps movies on various online platforms, including: download link 60fps movies