Get the classic SkyFactory 1 (SkyFactory 1.3.2, Minecraft 1.6.4 + Forge) running on a modern machine. It's an old pack and today's launchers mishandle its LWJGL native libraries, so it usually crashes ...
Restores classic CWSM 1.20.1 block, Wither Storm, and Formidi Blade textures in the Minecraft 1.21.1 members-only beta, including animations.