my superuser cant install binary update says installation fail

[Mosco agbas]

I tried to open rooted apps but it won't open says super user has to grant acess and my phone is rooted.when I open super user it notifies me to install an update when I click install it will load for some seconds and then installation fail ! I tried to reinstall from the app but didn't work.I am using Motorola droid RAZR v4.1.2 any help will be appreciated in fixing this.