I am getting
Failed to fetch file due to error "cURL error 60: SSL certificate problem: unable to get local issuer certificate (see http://curl.haxx.se/libcurl/c/libcurl-errors.html)
error message when I try to install a module in Drupal 8.1.8
I found https://www.drupal.org/node/2654474#comment-11232057 which seems to say it is a problem with my stack, UwAMP. I did not follow the procedure in that post because it indicated it did not fix the problem.
Can someone tell me how to fix this?