Most marketplace character packs for V4 require Morphs++ or Shapes++(as it's later called) for the included body shape to work. It's a standard. The reason for this is that it ensures that the morphs will work with the clothing products that other artists have made for V4, as those who have made said clothing products have taken steps to include morphs that fit those shapes in the garments. Like I said it's a standard.

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W10 Pro, HP Envy X360 Laptop, Intel Core i7-10510U, NVIDIA GeForce MX250, Intel UHD, 16 GB DDR4-2400 SDRAM, 1 TB PCIe NVMe M.2 SSD

Mudbox 2022, Adobe PS CC, Poser Pro 11.3, Blender 2.9, Wings3D 2.2.5

My Freestuff and Gallery at ShareCG