These alphas are provided as 2048x2048 16-bit maps and are compatible with software like ZBrush, Substance Painter, Blender, and Mari.
The by artist J. Roscinas is a collection of over 100 alpha textures designed for detailing stylized characters and assets. You can download this pack from professional marketplaces like ArtStation or Cubebrush . General Installation Guide Download File 100-ultimate-stylized-alpha-pack-...
If you'd like, I can give you specific steps for (like Mari or 3D Coat) or help you find licensing details for a specific project. These alphas are provided as 2048x2048 16-bit maps