If you are in doubt , check the SHA1 checksum.
On Linux , the sha1sum tool should be readily available or at least in the repos.
Note that the SHA1 checksum is provided for the .zip AND the .img file. (Look inside the .zip for latter)
• Don't like the board ? Missing features ? Change to the prosilver theme ! You can find it in your settings.
• Don't like to search the forum BEFORE posting 'cos it's useless ? Try googling : yoursearchtermshere site:raspberrypi.org