Uninstalling existing SSL certificates in hPanel
If you no longer need an SSL certificate on some domain, you can uninstall it by navigating to Hosting → Manage, search for SSL on the sidebar and click on it:
There, locate the domain and click on Manage:
And click on the options button (⋮) → Uninstall:
That's it! Now you can install a different certificate on the domain, such as a custom SSL.
NOTES:
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After the SSL certificate is uninstalled, your website will only be accessible by HTTP. Trying to load it as HTTPS will show an error
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If you would like to temporarily disable HTTPS to have your website available by HTTP, you can unforce HTTPS