Windows

• 1). Download the FCIV file from the Microsoft website (see link in the Resources section) and save it on your computer.
  
  
• 2). Double-click the file to extract it. Save the file in C:\windows\system32\.
  
  
• 3). Go to the Start menu and type "cmd" (without quotations) in the Run or "Search for programs and files" field and press "Enter."
  
  
• 4). Navigate to the folder hosting the file.
  
  
• 5). Type "fciv filename" (without quotations, and substituting the name of the file you wish to check) and press "Enter" to create the MD5 checksum.
  
  
• 6). Type "fciv --sha1 filename" and press "Enter" to create the SHA1 checksum.
  
  
• 7). Compare the checksum with the one provided with the file.
  
  

Linux

• 1). Open a terminal and navigate to the folder where the file is located.
  
  
• 2). Type "md5sum filename" (without quotations, and substituting the name of your file) and press "Enter" to create the MD5 checksum.
  
  
• 3). Type "sha1sum filename" and press "Enter" to create the SHA1 checksum.
  
  
• 4). Compare the checksum with the one provided with the file.
  
  

Mac OS

• 1). Open Terminal and navigate to the folder hosting the file.
  
  
• 2). Type "/usr/bin/openssl sha1 filename" (without quotations, and substituting the name of your file) and press "Enter."
  
  
• 3). Compare the checksum with the one provided with the file.