Please fill out the fields below so we can help you better. Note: you must provide your domain name to get help. Domain names for issued certificates are all made public in Certificate Transparency logs (e.g. crt.sh | example.com), so withholding your domain name here does not increase secrecy, but only makes it harder for us to provide help.
I’m sorry, I don’t even know what those questions mean. I have never dealt with SSL before. I would answer them if I could but perhaps the cert numbers will help
Someone else created the site for my client. The client knows nothing about it. I know nothing about it. I can just go somewhere else and buy a new one I guess.
That website lives on a virtual machine inside somebody's Amazon Web Services account. This somebody is paying for the machine and has access to it. You must discover who this is or there is nothing you can do about the certificate or website.
Those browser warnings can be overridden. Click on "advanced" or something similar and make an exception.
Getting a certificate usually is the easy part. Without access to your sites configuration (shell access as root or a control panel), you won't be able to actually install the certificate. Heck, you could buy a new certificate for many $$$, but you won't be able to use it. So with that in mind, it doesn't matter whether you get a new LE cert or go somewhere else.
Unless HSTS comes into play, I guess. (search "bypass hsts in «yourbrowser»" if you don't see where to add the exception -- and immediately forget how to do this)
You know, I've never dealt with an SSL cert before, and I'm following the instructions and the link that the host gave me and told me to follow. I might as well be in a foreign county, because I know nothing about this. Either does my client. It's past 7:30 on a Friday night and I've been trying to get this solved all day. So I'd really appreciate it if you kept your sarcasm to a minimum. I came here for help because there's no way to contact an actual person and explain what has happened. I am admittedly completely ignorant, but I didn't ask for this problem to fall in my lap. It did. Instructive help would be appreciated. If there is none, there is none. I'll solve it some other way. But don't be rude.