An apology, I just found your message in my inbox. Have you compiled previously with Lualatex? What happens if you use a MWE with a preamble that includes fontspec such as:
\documentclass{article} \usepackage{fontspec,luatex85} \begin{document} Hello world! \end{document} ? Regards _______________________________________________ Q: How can I leave the mailing list? A: See https://miktex.org/faq/how-can-i-leave-the-mailing-list