This is the last time I'm going to post in this thread about Copyright laws. Seriously. I mean it this time.
Copyright laws are not designed for easy reading and interpretation. They are purposely made to be as confusing as possible to benefit those with the highest paid lawyers (and the most of them). Depending on which high paid lawyer you ask, and whether or not you were paying them or if they were against you, you will get different answers on that cat picture question.
Some would say you own the copyright, and could sue someone for downloading it. Some might say wherever you hosted it owns the copyright (Facebook says this, as does Instagram, and I think Photobucket now claims it. Not sure).
For the Windows installer question, that's done as an automated process and is usually understood by the company marketing the program. If you were ripping the disc to run via something like Daemon's tools, or using an ISO, that would be different.
However, browser cache files have been used to convict. Usually in child porn, which is a subject I find very distasteful, and I have no desire to talk about.
At any rate, I'm done. I need a coffee and some breakfast. We now return to your regularly scheduled speculation, wishful thinking, and random comments.