Network error
The connection dropped before the file finished. Google suggests checking the connection, then resuming from the downloads panel or trying later. A partial file may remain, so do not delete it yet.
Disk full
The computer has no room for the file. Free some space, emptying the Recycle Bin as well, and download it again.
Insufficient permissions
Chrome could not save the file where it tried. Cancel and retry, or use Save link as and pick a folder you can write to, such as Documents or Desktop.
No file or Forbidden
The server is refusing: the file has moved or been removed, or you need to sign in. Go back to the site for a new link, or ask its owner.
When a .crdownload file stays behind
If the file can be fetched again, do that: a complete download is always better. If the link is gone, copy the .crdownload somewhere safe and choose it on our home page. The intact part is recovered on your device, with no upload.
Common questions
Does Crdownload fix the error in Chrome?
No. It changes nothing in the browser and cannot reach the original source. It works on the file the failed download left.
Is Crdownload part of Chrome?
No. It is an independent tool named after the file extension, with no link to Google.
Sources
Documents consulted for this guide.