TB: Oh, literally a manual download through a link? Got it...that would be the fallback solution.
On a related note, I was looking around for some native, no-install download-to-file solutions for Windows, and apparently there is something called "Windows Script Host"; it appears to be a runtime script interpreter that is pre-installed onto Windows. In fact, here's a tiny snippet that supposedly implements something like wget using jscript + the cscript host: https://gist.github.com/duncansmart/5821523 if anyone's interested in trying it out. Might be useful for creating a good clickable shortcut for downloading the XML file directly to the wildstar add-on directory.
WSRP Chat on Discord