i can't activate svrchok :(

hi guys, i’m a new user for Blender and i’m very interested for the SVERCHOK add-on. I followed thi guide https://github.com/nortikin/sverchok and at the moment when i’ve got to activate the Sverchok flag in the user preferences it doesn’t work.

Related: https://github.com/nortikin/sverchok/issues/604

well well well
just remove it delete from addonlist in propertyes, remove folder, save settings of blender and reinstall. If it is not macos and not old version of blender