I responded to a question re: using Let's Encrypt SSL certs at this comment. I now need to go in the other direction because I made a mirror of our live site on my laptop in an xampp environment (win 10). There I don't have, nor do I want to use, an SSL certificate.
First, I removed the https redirect in .htaccess. Then, I was able to "simply" deactivate the Really Simple SSL plugin by following https://really-simple-ssl.com/knowledge-base/uninstall-websitebackend-not-accessible. This made our local Wordpress site work and I could also get into the back-end. However, CiviCRM does not work from either the back-end or front-facing pages. From the back-end, it generates an error trying to bring up the CiviCRM dashboard. Both give the same error: "Parse error: syntax error, unexpected end of file in C:\vhost\sdbikecoalition\wp-content\uploads\civicrm\civicrm.settings.php on line 450"
 And, of course, I checked the civicrm.settings.php file and found nothing suspicious [/edit]
I suspect it is because, on our live SSL site, I went to Administer > System Settings > Resource URLs and checked Yes on "Force Secure URLs (SSL)". Is there somewhere I can change this by just directly editing a record in the CiviCRM MySQL database?
I suspect that will solve my issue as that was the only thing I did within CiviCRM that was specific to SSL.