This version of Unity is unsupported.
Method group is Obsolete

TextureFormat.ASTC_RGB_4x4

Obsolete Enum member TextureFormat.ASTC_RGB_4x4 has been deprecated. Use ASTC_4x4 instead.
Upgrade to ASTC_4x4

Description

ASTC (4x4 pixel block in 128 bits) compressed RGB texture format.

See Also: TextureImporter.textureFormat.