The columns environment internally uses minipage, so you can simply use minipages in your document; a simple example (I added some frames just as visual guidelines). The \Colsep length can be used to control the separation between the minipages:
\documentclass{article}
\usepackage{lipsum}
\newlength\Colsep
\setlength\Colsep{10pt}
\begin{document}
\lipsum[4]
\noindent\begin{minipage}{\textwidth}
\begin{minipage}[c][6cm][c]{\dimexpr0.5\textwidth-0.5\Colsep\relax}
\lipsum[4]
\end{minipage}\hfill
\begin{minipage}[c][6cm][c]{\dimexpr0.5\textwidth-0.5\Colsep\relax}
\lipsum[4]
\end{minipage}%
\end{minipage}
\lipsum[4]
\end{document}

I used a fixed height (6cm) for the inner minipages and center alignment but this, of course, is optional.
columnsenvironment internally usesminipage. You can useminipages in any document class. – Gonzalo Medina May 07 '13 at 15:19multicolpackage might be the way to go. – tparker Aug 12 '18 at 01:18