I have the latest whmcs with ClientX theme. The problem is that client x was poorly designed so I asked developer to make lots of design changes. He did what he could in overrides.css But the rest he did directly in the .tpl files.
This means I cant update the theme without losing all the changes. The knock on effect is that I cant update whmcs core because the theme may become incompatible, which could break the site.
So I assume the only option now is to not update either the theme or the core. So what's the consequence of this? Can I just run my business for thr next 10 years on out of date core and theme, or is that super risky for some reason?