If none of the above solutions work, it's possible that the issue is on the website's end. Report the issue to https://mkvcinemas.pink support by:
It looks like you're trying to share a link to with the word "fix" — possibly referring to a broken link, a site error, or a playback issue with a movie download from that site.
: For those using specialized hardware like a Raspberry Pi or Firestick, enabling the option for "Force 422 color subsampling"