Installation: put in one directory the files template.tex all *.sty files Images folder
Usage: type in your presentation in the template.tex. You can even rename this file. Compile with pdflatex or xelatex. Any modifications for background images will require creating new pdf files for the background.
This is a LaTeX beamer theme for CMLS, Ecole Polytechnique, written by Timofey Zakrevskiy. You can contact me via email timofey.zakresvkiy@math.polytechnique.fr