Upgrading the Blender is performed by running an executable file.  It is for a Windows computer only.

Access the Blender webpage and go to the 'Software' tab on the right hand side.  Download the latest software and unzip into a known place.

Plug a USB cable from the Blender to the Windows computer.  Makes sure that the Windows USB socket recognises the Blender.

Run the executable file that you have just extracted from the zip file and follow the instruction in the program that runs.

The unit will now be updated.