Call to undefined function get_user_locale()

You said that you need WordPress 3.9, but actually it uses the get_user_locale function that was introduced in WordPress 4.7, so I can’t open the BackWPup dashboard on my WordPress 4.6.

Could you please fix either the program or Readme.txt?

Fatal error:
Uncaught Error: Call to undefined function Inpsyde\BackWPup\Notice\get_user_locale() in /home/*****/*****/public_html/wp-content/plugins/backwpup/inc/Notice/Promoter.php:109
Stack trace:
#0 /home/*****/*****/public_html/wp-content/plugins/backwpup/inc/Notice/Promoter.php(121): Inpsyde\BackWPup\Notice\Promoter->locale_code()
#1 /home/*****/*****/public_html/wp-content/plugins/backwpup/inc/Notice/Promoter.php(89): Inpsyde\BackWPup\Notice\Promoter->message()
#2 /home/*****/*****/public_html/wp-includes/plugin.php(524): Inpsyde\BackWPup\Notice\Promoter->notice(”)
#3 /home/*****/*****/public_html/wp-content/plugins/backwpup/inc/class-admin.php(190): do_action(‘backwpup_admin_…’)
#4 /home/*****/*****/public_html/wp-content/plugins/backwpup/inc/class-page-backwpup.php(70): BackWPup_Admin::display_messages()
#5 /home/*****/*****/public_html/wp-includes/plugin.php(524): BackWPup_Page_BackWPup::page(”)
#6 /home/*****/*****/public_html/wp-admin/ in /home/*****/*****/public_html/wp-content/plugins/backwpup/inc/Notice/Promoter.php on line 109