How can I get Plex to play the next file in playlist or collection automatically?

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20

You just look at the first post at the install section and follow it: PM4K / PlexMod for Kodi (18, 19, 20, 21)

You’ll most likely install 0.7.7 then, as said, 0.7.8 will be released on the weekend and once you have set the repository up (and replaced your PM4K from the Kodi repository), it’ll automatically grab the update once it’s there.