add module problem

I’m new to drupal. When I right click, copy link, and paste a new module link, I always get the message,
“Failed to fetch file due to error “cURL error 77: SSL: can’t load CA certificate file /Applications/DevDesktop/common/cert/cacert.pem (see http://curl.haxx.se/libcurl/c/libcurl-errors.html)”
Unable to retrieve Drupal project from https://ftp.drupal.org/files/projects/views_slideshow-8.x-4.4.tar.gz.”
or whatever the module is i want. How do I get my modules?
Creighton

Drupal version: 


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