Because it is based on LoRA but is trained with Conv2D
Conv2D requires need extensions
https://github.com/KohakuBlueleaf/a1111-sd-webui-lycoris
or
https://github.com/kohya-ss/sd-webui-additional-networks

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Just a heads up, your first link is linking to https://github.com/KohakuBlueleaf/a1111-sd-webui-lycoris%EF%BF%BCor%EF%BF%BChttps://github.com/kohya-ss/sd-webui-additional-networks instead of https://github.com/KohakuBlueleaf/a1111-sd-webui-lycoris
oh




