I installed STIX2 fonts in otf format on my Win10 machine.
I tried:
\documentclass{minimal}
\usepackage{bm}
\usepackage{fontspec}
\usepackage{unicode-math}
\setmainfont{STIX2Text-Regular.otf}
\setmathfont{STIX2Math.otf}
\begin{document}
$$
\bm{\alpha}
$$
\end{document}
--------------------------------
by (under xelatex, miktex 2.9) I get error:
! Improper alphabetic constant.
<to be read again>
\mitalpha
l.11 \bm{\alpha}
?
Process has been terminated ...
------------------------
I can get standard text to work but I have issues with math. Where could I learn about this? I can use STIX rel.1x fonts in standard latex compilation (with \usepackage{stix}) but I wanted to try STIX2 for which there is no latex package yet.
Thanks Maurizio