and the referenced file will be downloaded automatically and placed in the 'texmf cache' if is not found in the cache already.
== In case of trouble ==
=== File not found ===
* You may get errors like
I can't find file `C:/Program.tex'.
This is likely caused by the luatex executable not handling filename quoting properly yet. If filenames with spaces work at all, you are just lucky.
== Cache internals ==