In the meantime, I'm wondering what "Express Edition" signifies. Is that just a euphemism for "Command Line Edition"?

In general, "Express Edition" signifies a cheaper version that may not have all the bells and whistles of the full version. The degree to which it is inferior, and the precise meaning of "cheaper", vary. If the full version is shareware, the Express version would normally be freeware, but that is not _necessarily_ the case when the full version is distributed commercially. I have seen "Express" versions of things that were limited-time trials, for instance.

So "Express Edition" in itself does not imply a command-line interface. However, it is possible that the Express Edition of this particular piece of software may have that feature. (I don't know, as I haven't used it.)