# Page Not Found

The URL `download` does not exist.

You might be looking for one of these pages:
- [Developer Documentation](https://www.happ.su/main/dev-docs.md)
- [Android TV API](https://www.happ.su/main/dev-docs/android-tv-api.md)
- [Provider ID](https://www.happ.su/main/dev-docs/provider-id.md)
- [Windows update](https://www.happ.su/main/faq/errors/windows-update.md)
- [Displaying flags and smileys](https://www.happ.su/main/dev-docs/emoji.md)

## How to find the correct page

1. **Browse the full index**: [/sitemap.md](https://www.happ.su/main/sitemap.md) - Complete documentation index
2. **View the full content**: [/llms-full.txt](https://www.happ.su/main/llms-full.txt) - Full content export

## Tips for requesting documentation

- For markdown responses, append `.md` to URLs (e.g., `/main/dev-docs.md`)
- Use `Accept: text/markdown` header for content negotiation