Minecraft updates frequently, and shader compatibility can be finicky. The "All Versions" zip file is a popular search because it typically contains:
Move the specific version you want (e.g., MollyVX_v1.2.zip ) into your .minecraft/shaderpacks directory. Select it in-game under Video Settings > Shaders. Conclusion file name mollyvxshadersallversionszip hot
Once you have the archive, do not just drop the "all versions" zip into your folder. Minecraft updates frequently