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CODEX (and any other scene group for that matter) has no website, they dont release to the public.
You can always check the megathread here or fmhy.net for sites that might have it. cs.rin.ru seems to have downloads for X-Plane 11 and 12 from a quick search.
Scene groups only release to other scene groups via ftp servers, they dont release in places the average joe can download them. Their releases trickel down from people with access to those ftp servers and hit usenet and private trackers before then hitting public trackers.