Thanks for checking out our pack. About the file size, the models themselves are not that big in size. The textures make up 99% of the zip provided which contains 1K to 4K variants for multiple PBR workflows including PBR MetallicRoughness, UE4 Workflow, Unity HDRP, and Unity URP.
The 1K Variant of PBR Metallic Roughness with the Models is about 9MB in size.
The files contain textures of multiple sizes and use cases hence the high download size. Hope this clarifies your query and feel free to ask us any other questions you might have regarding this asset pack. Hope you have a great time while using our assets, and Happy Holidays!!😇🎉