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Can you make a small compilable example for us to reproduce the issue,?

It is at latextemplates.com

This topic is very old and for an obsolete version of the template. For the current version, package biblatex is used.
Have a look at https://en.wikibooks.org/wiki/LaTeX/Bib ... or_Chapter

In the preamble of your document, use

As far as LaTeX is concerned, package subcaption can handle this.

There are other packages as well, but subcaption is the most recent one.

A user can install packages in user mode and does not need admin rights. On the other hand, MikTeX and Texniccenter... Seems like nobody reviewed other possibilities within the last decade. MikTeX itself comes with an Editor named texworks. An alternative to MikTeX would be TeX Live, which also ship...

Are you looking for \addchap{Introduction}? Do you want unnumbered chapters in general? -> \setcounter{secnumdepth}{-10}

Or do you just need the first unnumbered? -> \frontmatter and \mainmatter

https://github.com/johannesbottcher/MDT-Quick-Manual/

Try option sorting=none for package biblatex.

This is a biblatex question, it is unrelated to the template.

https://github.com/johannesbottcher/MDT-Quick-Manual