Support

Get help, report issues, and learn how to troubleshoot download failures.

Contact

Common issues

Slow speed

Many servers throttle aggressive parallel range downloads. Try setting Max Threads to 1–4.
Some networks throttle large downloads. Try another network or a VPN (if legal and allowed).
Device power saver modes can slow background work. Keep the app in foreground during testing.

Unknown size / streaming mode

If the server does not provide Content-Length or does not support range requests, HDown will switch to streaming mode. In streaming mode:

progress percentage can be unavailable or shown as indeterminate,
resume may restart from the beginning (to avoid corruption),
speed is still shown based on real-time bytes received.

Resume not working

Some servers ignore the Range header and always return status 200. In that case HDown may restart from zero to avoid appending incorrect bytes.
If a file is changing on the server, resume may be rejected (ETag/Last‑Modified mismatch). Restarting ensures correct content.

Leftover temp parts / storage not freeing

Use Settings → Clear All Private Data. This deletes cache, temporary parts, and encrypted resume state. It does not delete finished files from the Downloads folder.

What to include in a bug report

Android version + device model
App version
Server domain (do not share private tokens/URLs)
Whether the server supports resume/range downloads (if known)
A screenshot of the error and the Detail screen