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Okay, I've found those specific trees that look bad, as if the branches were enlarged, but I can't replace them. After replacing or deleting them, only textureless skeletons remain. The file is located at: GEMRed 0.5.2.pak\Textures\auto-imported_______320\TerrainObjects\Grass\Trees\Autu mn_Trees\TreeBig, and the file names are Pino.dds and Pino.xdb. If the author or anyone who knows how to solve this problem could provide guidance, or perhaps replace the texture with a more realistic one.
This is how the coniferous trees currently look:

And this is how they looked before:

How can I revert to that version?!!