as title stated,i have no idea how to update the game since i have an older version of the game
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The "update files".zip is only for the previous version to the newest. If you're missing more than one update it's usually best to re-download the full new game again and move the save files from the old game folder to the new one, so that you can continue your playthrough.
I made a video about both,(using update files and moving save files) here: