Corruption Of Zip Files When Downloading What causes this?

It would have to be on there side, when downloading sometimes the infomation gets left behind in the download thus corrupting it and making it unable to download completly.Best suggestion would be to reupload the file again and ask htem to download it. This usually corrects the problem.

Best suggestion would be to reupload the file again and ask htem to download it. This usually corrects the problem.

What Operating System are they using? I know that some of the more advanced features, like encryption with WinZip, don't work on other operating systems. I'd try asking them that and see what there responses are.

Some archive/compression software have a feature to repair corrupted ZIP or other archive files. You could tell them if the archiving program they're using supports that, to go ahead and try it, and see if that works.

This could simply mean that those users of your site have an unstable router or connection and it stops in the middle of a download so the file doesn?t download completely and although a zip is saved on their HD then it?s impossible to open.

same thing happened to me, but some people could download it without any fuss one person had all the trouble in the world. In the end the person somehow got it working, anyway, sorry i have no idea how to fix it.

Within WinRAR there is a feature to repair RAR files.If they are severly damaged you need some repairblocks to repair the archive.(is usefull when you use multi part RAR files).Another program that can do the job is QuickPAR (freeware).Here can the sender make some repair blocks with the original file.On the reciever side you can check if your file is not damaged and it says howmany blocks it need for repair.When the sender sends you the blocks (i.s.o. the whole file) you can fix your file.This works easy and if you already have 2 versions of the file maybe you can get a correct version when you add the 2 files.The only thing you need to start is the program and some blocks from the sender.Normally a firewall can only filter some IP packets (and it deletes the whole pakket).Damaged files can be caused by some (bit)faults on your internet access.(like phone line , DSL line or Cable).You notice this problem the best when you download big files.In unix world they add often and .md5 check file by the big iso file.This md5 file can also be checked with Quickpar.

I think that if you made an md5 sum of the file, google will help you find a program for that, and asked them to do the same you can see if file contents are being lost or wether their software is to blame. Another thing could be to zip it in another format such as a tar or .gz or something as well as the .zips or try a different compression rate like a slower one to make it smaller or a faster one to make it larger to see if that helps.