@Jenny: have you downloaded directly from mediafire or using a multihoster?
have you tried to download the file manually in browser and checked it?
either the file is damaged in first place
or your setup/system has issues (check your memory with memtest86 and your disk with smartdata)
or firewall/av cause issues
or a used multihoster is causing the issue
can you provide example link to such a broken archive, then we can check ourselves
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JD-Dev & Server-Admin
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