You can use checksums to check files and other data for errors that occur during transmission or storage. For example, a file might not have properly downloaded due to network issues, or hard drive problems could have caused corruption in a file on disk. If you know the checksum of the original file, you can run the Calculate Checksum utility on it. If the resulting checksum matches, you know the file you have is identical.
You will find this feature in the menu Commands > Calculate File Checksums.
If you downloaded a copy of the file and its checksum doesn’t match what you expect, try downloading the file again.