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Downloader breaks are usually caused by platform changes (HTML/JS rewrites, new anti-scraping measures), URL formats changing, expired/permanent links, or temporary rate-limiting and blocking. Maintaining a downloader is a cat-and-mouse game: you must track platform updates, update parsers, handle edge cases (private accounts, geo-restrictions), and expose friendly error messages and retry options for users. Provide troubleshooting steps: confirm the link is public, try alternative quality options, wait and retry, or use a browser extension/official APIs if available.

Yes — many download solutions support high resolutions (including 4K) and subtitle extraction (SRT/VTT) for videos that provide captions. The easiest, fully legal route for offline 4K viewing is via platform-provided features (e.g., YouTube Premium for mobile app downloads); third-party tools can extract captions or higher-quality video files when technically possible, but you should highlight copyright rules and prefer subtitle extraction for accessibility/translation use cases.

Many third-party tools advertise “no-watermark” downloads but results vary by method. Official app downloads usually include the watermark; third-party scrapers or specialized services attempt to supply a version without the overlay. However, removing watermarks can raise copyright/terms-of-service and ethical questions — and technical reliability varies (and can break when the platform changes). If you implement or promote a “no-watermark” feature, add clear legal guidance and guardrails for permissible uses.

Common causes: (1) the platform stores audio and video separately and some download methods fail to merge them correctly; (2) the original post may have no audio or the audio track is protected; (3) temporary network or server errors during processing; (4) format or codec mismatch after conversion. Practical fixes: re-parse the original link, try a different quality/format, use a downloader known to re-mux audio+video (or re-encode with ffmpeg), or re-download from the native app if possible. For Twitter/X specifically, separate audio/video storage is a frequent reason for silent downloads.

Legality depends on the platform’s terms of service and copyright law in your jurisdiction. Many platforms (YouTube, Instagram, Twitter/X, TikTok) prohibit downloading or redistributing copyrighted content without permission; the safest options are (a) using official offline features (e.g., YouTube Premium), (b) downloading only content you personally own or that is explicitly licensed for reuse, or (c) obtaining explicit permission from the copyright owner. Make sure your site includes a clear copyright/disclaimer page and a takedown / DMCA process.