How to resume interrupted downloads on Windows
Few things are more frustrating than a 4 GB download failing at 95%. The good news: with the right tool, an interruption almost never means starting over.
Why downloads break
- Wi-Fi drops or the network switches (Ethernet to Wi-Fi, VPN reconnects).
- Windows reboots for an update, or the PC sleeps.
- The server times out or briefly rate-limits you.
- The browser is closed by accident.
Why browsers often can't resume
Most browsers keep only a loose hold on partial downloads. If the connection drops or the browser restarts, the partial file is frequently discarded and you begin again from zero. There's usually no checkpoint of exactly how many bytes were safely written.
How reliable resume works in PDM
PDM continuously checkpoints progress to disk for every segment of a download. Each connection knows precisely which byte range it has completed. When something interrupts the transfer, PDM re-requests only the missing ranges using HTTP range requests — so a reboot, a dropped connection, or a manual pause all pick up exactly where they left off, without redownloading a byte.
Recovering a download
- Reopen PDM — in-progress downloads reappear in the queue with their saved progress.
- Select the paused or failed item and click Resume.
- PDM verifies what's already on disk and fetches only the remaining ranges.
For files that must be perfect (installers, disk images), PDM also verifies the SHA-256 checksum for signed releases, so you know the finished file is intact.