Download this rigged robot on Artstation: https://www.artstation.com/a/37333260
This robot has been modeled and rigged in Blender 3.0. So, you can use the character in Blender 3.0 and up.
The robot has been modeled with quads and n-gons with Non UV-Unwrapping. So you can use the robot only in Blender.
Please see detail about robot in the video.
In this product file, you will get:
+ A Rigged Robot
+ A Blender 3.0 File
With Subsurface = 0: Vertices = 83,023 ; Faces = 81,168