WINDOWS

download hashcalc from

SlavaSoft HashCalc - Hash, CRC, and HMAC Calculator

Its a free tool

Install it if it needs it

open hashcalc
uncheck all the checkboxes except md5
change data format to file
in the data box at the right hand side is a button with 3 dots in click it now navigate to where you downloaded your .iso or .zip and select it and click open

now press calculate
after a few seconds (or more depending on your computer speed) there will be a string next to the md5

now compare that to the md5 hash on the download page

if they are the same then your iso or zip is ok, if not the you need to download it again

the hash should be:

Name:: bt4-final.iso
Size: 1570 MB
MD5: af139d2a085978618dc53cabc67b9269

Name:: bt4-final-vm.zip
Size: 2000 MB
MD5: 733b47fad1d56d31bc63c16b3706a11c


LINUX

make sure that .iso or zip is somewhere easy to navigate to eg \root

Open a console Window and navigate to that folder and type

md5sum <name of file>

after a few seconds you will get a response

the hash should be:

Name:: bt4-final.iso
Size: 1570 MB
MD5: af139d2a085978618dc53cabc67b9269

Name:: bt4-final-vm.zip
Size: 2000 MB
MD5: 733b47fad1d56d31bc63c16b3706a11c


as long as this is the same as the hash should be, you are good to go.


BTW these steps will work for any file that you need to check the md5 for.