Zip file is corrupt after download

I fixed it. I don’t know why, but I had to clean and flush the output buffer after setting headers and before letting the file send.

The existing headers look like this:
header(“Content-Description: File Transfer”);
header(“Content-Type: $mtype”);
header(“Content-Disposition: attachment; filename=\”$asfname\””);
header(“Content-Transfer-Encoding: binary”);
header(“Content-Length: ” . $fsize);

I added these lines (notice a few new headers):

header(‘Expires: 0’);
header(‘Cache-Control: private’);
header(‘Pragma: private’);
ob_clean();
flush();

No more corrupted zip files.

Wow, thanks for posting your solution! (It totally worked for me) A note to future readers, you make this change in process.php of the plugin’s files.

Added the lines to the process.php
..not working for me , any other ideas? my Zip files are “broken” and empty if downlaoded with Download Manager

It happened to me too. I put on a gz file and downloaded for several times successfully. But some of my friends failed and got different file size every time (download incomplete?) I then tried another twice and one went okay and the other went wrong. I figure out it happens randomly. Is that a problem with my server or bandwidth or some limitation from the plugin? (the file size is about 4MB)