How can I use picker in Auto Rig? I installed Auto Rig 3.41.59 and I could bind the rig and everything works fine.

the only problem is I can't use the picker.

You can download the blender file
did you check if your proxy picker is the same version as the one in the the auto rig pro addon folder?  I updated the Mike rig to play with it, and used the proxy picker that come with the Mike rig and I had the same problem