Do the mods correspond to the version of the game you're playing? There's 3 distinct versions (Legacy, Demo, and Release) and each of them can only load mods meant for that version. The mod site bbooru.fun has filters for each version, and the Discord also has a tagging system. Judging from the fact that there's a thumbnail visible, I'm guessing you downloaded a mod for the Legacy version (which supports thumbnails, and all versions of the game use "thumb.png" for a mod thumbnail). Here's a download for the legacy version
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