compare both files, I already downloaded the target file, but I doubt the downloaded bytes have errors and null.
<source> file1 is from a direct link .iso, sample http://anylink.org/files/anyisofile.iso
<target> file2 is from a local directory .iso, sample c:\downloads\anyisofile.is
compare file byte by byte from source to target, if any byte is different from source to target?, it repairs the target file.
I am looking for a free software to do this kind of task.