With MikTEx or TexLive on Windows, using up-to-date packages, the compilation of the template fails with:

! LaTeX Error: Command \comment already defined.
               Or name \end... illegal, see p.192 of the manual.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
 ...

l.791 }

It looks like the changes package has introduced a \comment command in November (see https://gitlab.com/ekleinod/changes/blob/master/changelog.md#300-2018-11-04) which now collides with another comment command already present somewhere else.

A quick workaround is adding \let\comment\relax before the \RequirePackage{changes} in ifiseries.sty.