They seem to have added "Download PDF" buttons to every issue at the usual link https://cacm.acm.org/issues. There's also the digital library https://dl.acm.org/
Slow way: Click archive, navigate to the issue, select PDF.
Faster way: On the right hand side (desktop) there's a vertical bar with some buttons click the circled i, then "Issue's Table of Contents". Takes you to the issue's page and you can get the PDf.