Ok, I think you maybe need to calm down and get some perspective.
Just Google “Undefined variable: eqlabel” and you’ll find a tonne of websites like this that have been broken for ages. Use WaybackMachine to check them if they’re fixed now.
– http://engineerintrainingexam.com/eit-review/mathematics-for-engineering/integral-calculus/
At first I just thought it was your plugin that was faulty. Seems like it may be an symptom of a much broader faultiness.
Unethical? What? It’s broken a whole bunch of websites, in a release you pushed 2 years ago. It’s not fit for use on any serious websites with a site-breaking bug like that. Cop it on the chin mate, you don’t get a spotless 5 star rating for a broken plugin.
Which part is .htaccess and which part goes in default-ssl?
Is it possible to access this stuff on a shared hosting server, just through cPanel or FTP? Or do you need to do all that ugly SSH stuff?