I'm running a website for a while and I'm still learning how to manage it. One thing I've noticed is that some visitors download all zip files in the same order ( there is a pattern of downloads). I've also noticed that the referrers of those visitors are always blank. I think these downloads are done automatically with the help of certain software. My question is: Are those visitors hackers? If they are, why are they doing this when they can download my files legally?
The use of tools to download your files does not mean they are doing anything illegal. In fact, if your files are made available on your website, I don't see downloading them in any particular way could be construed as illegal.
Perhaps if the resources you make available on the website are useful downloaded en-mass, perhaps you should make a single download for them.