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 still don't know what the router would stop me from using 443 by using it for http. Not sure what that means. This is the only reference to 443 ion the router NGF18MESH Netcomm.
It seems that apache is now not working due to my changing the conf files too many times trying to get this to work.
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I think it best I reinstall apache cleanly.
My question is, if I do this, can I download all of the necessary certificate files that I originally had?
You cannot download the Private Key (if you have security, it is private) from anywhere!
Since you would copy the Private Key you might as well copy the Issued Certificate as well.
But yes you can find the Issued Certificate here crt.sh | celebritymc.com, presently you only have one. Click on it and the next page you will see, click Download Certificate: PEM