You have received a zip file on Mac but it is not opening and showing checksum error, now you are looking to fix zip file checksum error on Mac as it contains some sensitive data. Zip files are used to compress as bunch of files so that they can be easily transferred through internet or via flash drives. But if the file is broken then you will encounter checksum error which can happen if the compressing was not done right or there was any interruption while transferring the files. If you have got the broken file then if you can manage to get a fresh copy of the file then you can skip the steps to fix zip file checksum error on Mac. If the error is shown because of your own system corruption then you can use the time machine to get that file back. When the time machine does not work then use the Mac data recovery software that supports the repair and recovery of the .rar files. It is the most effective solution to fix zip file checksum error on Mac. You can easily extract the recovered file so you should download the software and restore zip file.