multicols
is not suited here. Better use minipages.
I removed everything unrelated to the issue, which really leaves a minimal example. And my, the default appearance of the class is ugly.
Code: Select all
\documentclass[portrait,a0paper,fontscale=0.285]{baposter}
\usepackage{graphicx}
\graphicspath{{figures/}}
\usepackage{amsmath}
\usepackage[font=small,labelfont=bf]{caption}
\def\name{Software Name}% Note diff
\usepackage{lipsum}
\definecolor{lightblue}{rgb}{0.145,0.6666,1}
\begin{document}
\begin{poster}
{
headerfont=\Large\bfseries\scshape,%<= Note the difference
columns=1,
headerheight = 0.13\textheight
}
{}
{\bfseries%<= Note the difference
\textsc{\Huge \name}\vspace{0.5em}}
{\scshape University of ... \\ Institute of Computer Science\par}% <= Note the difference
{}
\headerbox{Website}{name=website,column=0, row=0, span=1,}{
\begin{minipage}{.48\linewidth}
\includegraphics[width=\linewidth]{example-image-a}
\captionof{figure}{Sample screenshot}
\end{minipage}
\hfill
\begin{minipage}{.48\linewidth}
\lipsum[2-2]
\end{minipage}
}
\end{poster}
\end{document}
The smart way: Calm down and take a deep breath, read posts and provided links attentively, try to understand and ask if necessary.