On another site there is “Base import.” But it doesn’t work. I can’t upload it to the site. Please watch the video from the screen https://disk.yandex.ru/i/2H9GHavIqFEJvg
Please make the full backup of your site, uploading the demo would reset all your options and provide your site admin access to the private area.
Please confirm the permit for us to deactivate the plugins not related to the theme and switch to the parent theme for the while of checking what may take up to 15 minutes.