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Go to your Trakt account → Settings → Connected Apps → remove Cinema HD if it’s listed. Then reopen Cinema HD and re-login.
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Make sure you’re on the latest Cinema HD (v3.4.1) from the official site (older builds sometimes break login).
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If you still get stuck on the CAPTCHA, that’s a Trakt-side change and only the Cinema HD devs can patch it.
Try v3.4.3 stable version, it’s working at themoment than previous ones - https://cinema-hd.app/