Cleanup & Repair Existing Website Subdomain

Job ID: 31721337

Budget: $30 – $250 CAD

Website is currently housed on primary domain (https://www.cemcorp.com/) as subdomain (https://www.cemcorp.com/installcorp.ca/) and after installing an SSL on the primary website, the subdomain website (installcorp.ca) is no longer working. When I click on any of the links I get a 404 error page. We do not have a backed-up version of the site, so if repair isn't possible I will have to rebuild it once the theme and wordpress are installed.

Requirements:
-diagnose why subdomain isn't appearing correctly since installing SSL on primary domain
-Repair or upload any missing files so website is function
-Reinstall theme and most recent wordpress version
-Clean up of the primary domain in cpanel

I have included screenshots of the current site, the theme, as well as a word document of what the site looked like before the error occurred.
Related categories: PHP Web Security WordPress HTML Website Management