

The file was not downloaded properly and some of its elements might have been corrupted. The file might be modified by someone else in an unauthorized way. Thus, there are the two main reasons if the MD5 hash value of a file you downloaded does not match against the original sum: The perfect match of MD5 checksum value ensures that the digital integrity and security of a file has not been broken by someone else and also that it is the accurate copy of the original file. You can assign an MD5 sum even to a text or document file.
MD5 CHECKSUM ONLINE ARCHIVE
It is used not only to encrypt a ZIP archive or an EXE installer but all kinds of files. These numbers are generated using special tools that employ “cryptographic hash function producing a 128-bit (16-byte) hash value”.

The MD5 hash of the file is displayed in the Terminal.Drag the downloaded file from the Finder window into the Terminal window.Open the Terminal, from the Applications / Utilities folder.Download the file you want to check and open the download folder in Finder.
