\RequirePackage[manualmark]{scrlayer-scrpage}
\iffalse
\renewcommand*\chaptermark[1]{%
    \markboth{\Ifnumbered{chapter}{\chaptermarkformat}{}}{#1}% <- outdated macro replaced
}
\AfterTOCHead[toc]{\markboth{}{\contentsname}}
\fi

\clearpairofpagestyles
\clubpenalty = 10000
\widowpenalty = 10000

\automark[section]{part}
\setlength{\footheight}{120pt}      % avoids scrlayer-scrpage warning:
% footheight to low warning
\setlength{\footskip}{185pt}        % BAD HACK that moves the foot downwards
\KOMAoption{footwidth}{foot:53pt}   % BAD HACK that moves the foot towards
\setkomafont{pagefoot}{\normalfont\footnotesize}
\setkomafont{pagenumber}{\normalfont \fontfamily{\sfdefault}\selectfont \normalsize  \bfseries\color{black}}

\renewcommand{\partmark}[1]{%
    \markboth{%
        % use \@chapapp instead of \chaptername to avoid
        % 'Chapter A Appendix ...', thanks to @farbverlust (issue #47)
        \fontfamily{\sfdefault}\selectfont
        {\color{fgBlue}\textbf{\partname\ \thepart}}%
        \quad%
        \protect\begin{minipage}[t]{.65\textwidth}%
            #1%
            \protect\end{minipage}%
    }{}%
}

\newlength{\lensectionnumber}
\renewcommand{\sectionmark}[1]{%
    \markright{%
        \normalsize\fontfamily{\sfdefault}\selectfont\bfseries
        \setlength{\lensectionnumber}{0em}
        \settowidth{\lensectionnumber}{\textbf{\thesection}\quad}
        \protect\begin{minipage}[t]{.72\textwidth}%
            {\ }% bad hack to prevent a wrong baseline for the minipage
            \protect\raggedleft%
            \hangindent=\lensectionnumber%
            {\color{black}\textbf{\fontfamily{\sfdefault}\selectfont\thesection}}%
            \quad%
            #1%
            \protect\end{minipage}%
    }%
}

\newcommand{\ctfooterline}{%
    \color{black}\rule[-90pt]{1.25pt}{100pt}%
}

% Page number for odd (right) pages
\newcommand{\ctfooterrightpagenumber}{%
    \ctfooterline%
    \hspace*{10pt}%
    \begin{minipage}[b]{1.5cm}%
        \pagemark\ %
    \end{minipage}%
}

%% Page number for even (left) pages
\newcommand{\ctfooterleftpagenumber}{%
    \begin{minipage}[b]{1.5cm}%
        \raggedleft\pagemark%
    \end{minipage}%
    \hspace*{10pt}%
    \ctfooterline%
}

%% Defines the content for header and footer
\lehead{}
\cehead{}
\rehead{}
\lohead{}
\cohead{}
\rohead{}
\lefoot[%   > plain
    \ctfooterleftpagenumber%
]{%         > srcheadings
    \ctfooterleftpagenumber%
    \hspace*{0.75cm}%
    %\headmark%
}
\cefoot{}
\refoot{}
\lofoot{}
\cofoot{}
\rofoot[%   > plain
    \ctfooterrightpagenumber%
]{%         > srcheadings
    %\headmark%
    \hspace*{0.75cm}%
    \ctfooterrightpagenumber%
}