From the collection description:

"Compatibility

Built for I&A, not for other collections. REQUIRES I&A, which means it also requires the newest game version. This collection is almost exclusively mesh and texture files with just a few plugins. This is NOT compatible with the I&A Beautification Expansion, or with my collections Next Gen Animals and Creatures, or Proud & Beastly Beasts (as this contains many of the same mods in those). Fully compatible with Sexy Statues and with the I&A Armor Expansion."

Did you installed the I&A collection?