\documentclass[fontsize=14pt, BCOR=15mm, fleqn, headinclude=true, parskip=half, DIV=calc]{scrbook}

% Packages
\usepackage{amsmath,amssymb,amsthm}
\usepackage[]{latexsym,epsf,color}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage{graphicx}
\usepackage[linkcolor=black]{hyperref}
\usepackage[ngerman, english]{babel}
\usepackage{booktabs}
\usepackage{array}
\usepackage{longtable}
\usepackage{tabularx}
\usepackage{multirow}
\usepackage[all,cmtip]{xy}
\usepackage[babel, german=guillemets]{csquotes}
\usepackage{paralist}
\usepackage{setspace}
\usepackage{enumitem}

\addto\captionsngerman{\renewcommand{\figurename}{Abb.}}
\addto\captionsngerman{\renewcommand{\tablename}{Tab.}}

% Size of pages
\textwidth15.5cm\textheight24cm\topmargin-15mm %\voffset-10mm %\toppmargin-25mm
\parindent6ex \oddsidemargin0em\evensidemargin0.2em

% Layout
%\noindent
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\tolerance=1000

% Headings
\usepackage{scrlayer-scrpage}
\pagestyle{scrheadings} \clearscrheadings \chead{\pagemark}

\makeatletter
\g@addto@macro\UrlBreaks{\do\a\do\b\do\c\do\d\do\e\do\f\do\g\do\h\do\i%
\do\j\do\k\do\l\do\m\do\n\do\o\do\p\do\q\do\r\do\s\do\t\do\u\do\v\do\w%
\do\x\do\y\do\z\do\&\do\1\do\2\do\3\do\4\do\5\do\6\do\7\do\8\do\9\do\0}
\def\do@url@hyp{\do\-}
\makeatother

%\numberwithin{equation}{section}
\renewcommand*\theequation{\arabic{equation}}
\renewcommand*\thefigure{\arabic{figure}}
\renewcommand*\thetable{\arabic{table}}
%\renewcommand*{familydefault}{cmr}

% Page counter
\setcounter{page}{1}

%\itemsep=-7mm

% ---------------------------------------------------------------
\begin{document}
% ---------------------------------------------------------------

\begin{center}
\textbf{\Large Topic of the Presentation} \\
\textbf{Author with first name and surname } \\
{\small Academic institution} \\
{\small Email}
\end{center}

\noindent {\textbf{Abstract.} 150 - 500 words text}

\vspace*{70ex}

\noindent Bibliography optional

\begingroup
\let\clearpage\relax
\let\cleardoublepage\relax
\let\chapter\section
%\begin{thebibliography}{99}
%
%\end{thebibliography}
\endgroup

\vspace*{2ex}

\end{document}
