\documentclass[17pt, t, lualatex]{beamer}
\title{Title}
\date{\today}
\institute[KTH]{KTH Royal Institute of Technology}
\author{Author}
\usepackage{amsmath,amssymb,mathtools}
% Probably load as late as possible
% Other options are
% - engine=pdflatex to compile in pdfLaTeX (with different fonts),
% - mathshape=rm to use serif font for math,
% - mathsahpe=custom to not set any math font (so that you can define your own math fonts)
\usetheme[engine=lualatex, mathshape=sf, fontdir=kthpq-files/fonts/Figtree/]{kthpq}
\setmonofont{Bitstream Vera Sans Mono}[Scale=.9]
% Custom colors (see beamercolorthemecustom.sty for more details)
%\usecolortheme{custom}
% Custom footline
%\setfootline{left}{center}{right}
\begin{document}
\inserttitlepage
\section{Section title}
\insertsectionpage
\begin{frame}{Frame title}
\begin{block}{Block}
Lorem ipsum!
\end{block}
\end{frame}
\insertendpage
\end{document}
