Choice of processor

[Arash Esbati]

Philip Taylor <P.Taylor at Hellenic-Institute.Uk> writes:

> OK, adding "\input luaotfload.sty" appears to allow access to some
> (but not yet all) system fonts (LuaTeX states that it cannot find
> "Avenir LT Std 45 Book")
> [...]
> — the reason for that remains to be investigated.

Maybe because you've installed that font (or you've got it installed) as
part of MS Cloud fonts in Office.  AFAICT, those fonts are not installed
in standard (system) folders for fonts[1].  Hence, luaotfload cannot
find them OOTB.

Footnotes:
[1]  https://superuser.com/q/1433509