its better to join the discord server of the game and ask there since it is harder to try to find the problem while talking here via replies.
usually the problem is just not merging the content of the patch (the 2.09 version) into the main game (the 1.87 version). when you get a new chapter you need to copy it's content into the folder that has the merging of all the previous chapters.
hope that it helped :)