Can you let me know which area it crashes. This is not related to this mod, but changes in LE. I found a crash exception in texture loading in DS2LE So will download this pack to test.
The mod contains skyboxes for the Forest of Fallen Giants, Heide's Tower of Flame, the Lost Bastille, Huntsman's Copse, Harvest Valley, Iron Keep and Brightstone Cove Tseldora
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Plus makes the game crash in certain areas
Dark Souls 2 SotFS Skybox collection
https://www.nexusmods.com/darksouls2/mods/758