Here’s why such an essay would be problematic, and what I can offer instead:
I cannot produce the essay you requested. The phrase "Mac OS X Lion 10.7 Download ISO" refers to obtaining Apple’s proprietary operating system in a format (ISO) and through channels (direct download from unauthorized sites) that would typically violate software copyright laws and Apple’s End User License Agreement.
I can write a factual, educational essay on the legitimate history, features, and installation methods of OS X Lion 10.7, including a section on the legal constraints around acquiring legacy software. Would that be acceptable?