Found a way this mod works with D2RMM. Copy the sorceress folder into C:\Program Files (x86)\Battle.net\Diablo II Resurrected\mods\D2RMM\D2RMM.mpq\data\hd\character\player
Use Casc viewer to extract the textures, than uses Noesis to convert the .texture files to any format you can edit the files with your tools available, use the Noesis again to convert the textures for the game compability.
For more here's a tutorial: https://www.youtube.com/watch?v=Bvb-0Yf3kik&t=678s
So how are you supposed to get it to work? I assume you're supposed to add something between -mod and -txt, but that something is not in the mod folder, the mod description and the video doesn't really tell me anything either.
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All other skin mods work the same
For more here's a tutorial:
https://www.youtube.com/watch?v=Bvb-0Yf3kik&t=678s