What is the benefit of using force download

Hi guys,

I was thinking to have a section to give access to users about download some files from my website.

The basic way is to put the full path as <a> or something like that.
But i want to hide the path, like when you click on the download button, find the file's id from DB and then just push to the browser to download. (in simple explain: never show the path to user ).

Is it possible? if its not please help me to have some other ways to make it.

the Purpose is to selling the files online, but if the user have the path ( my/files/file1.zip ) can guess the next is ( my/files/file2.zip ) and then they can use some download software to type file2 manually and then download, which is i wanna avoid this as much as i can.

Any idea?

Thanks for helps