\usepackage[utf8]{inputenc}
\usepackage[german]{babel}
\usepackage{graphicx}
\usepackage{paralist}
\usepackage{microtype}
\usepackage[a4paper,left=1.9cm,right=1.5cm,top=1cm,bottom=1cm,landscape]{geometry}
\usepackage{multicol}
\setlength{\columnsep}{1.5cm}
\usepackage{titlesec}
\titleformat*{\section}{\LARGE\bfseries\center}

\usepackage{hyperref}
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    pdfstartview={FitH},
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    colorlinks=true,
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    citecolor=black,
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    urlcolor=blue
}
\pagestyle{empty} 

\newcommand{\software}[7]{
\subsection*{#1 (#2)}
#3 
\begin{compactitem}\medskip
\item \textbf{Betriebssystem:} #4
\item \textbf{Lizenz:} #6
\item \textbf{Deutschsprachig:} #7
\item \textbf{Homepage:} \url{#5}
\end{compactitem} 
}

\newcommand{\thema}[1]{\twocolumn[{\section*{#1}}\bigskip]}