Widely documented. I looked at your thread and couldn't find any detail where you would be stumped. You might have to supply the .ISO link so I can check it for errors.
You locked a discussion because the poster asked for help with .iso files because you assumed the downloaded content was illegal.
Many linux distributions are delivered as .iso files. Bootdisk.com and several other sites also provide legal and useful software as .iso files. Microsoft even allows some software to be downloaded as .iso files.
Pirated content can be found in any legitimate format -- iso, pdf, rar, mp3, etc. Filtering discussions based on a reference to a single file format certainly doesn't seem like a fair policy and I don't believe it is in keeping with the spirit and intent of the forum policies.