The package as it came wasn't quite what I wanted but, after hunting through the code, I was able to customise it to more or less what I'm after. The code itself has some useful comments in it but finding the files you need to amend is not so easy if you're not an experienced user. I also found that no one seems to have cracked the complexities of the user permissions. There are several queries posted on the Forum but not so many answers.
But the bottom line is that this is a useful component if you want a simple, straightforward download facility. If you want more than that, then be prepared to pay for it!