These are popular third-party sites that provide high-quality Urdu subtitles and dubbed versions. They usually offer multiple servers where you can stream or find "save as" options for mp4 files.
Searching for the specific episode title here often yields several uploads from different translation groups. Episode Highlights
As the official broadcaster in Pakistan, Geo TV uploads episodes shortly after they air. You can search their YouTube channel for "Kurulus Osman Season 4 Episode 5 Urdu Dubbed."
When looking for "mp4" downloads, be cautious of pop-up ads or unofficial sites that may prompt you to download "players" or "update software"—these are usually unnecessary and can be unsafe.