LiveUpdate Stopped Working on SEPM with return code = 2

I came to know that our SEPM server was not updated for last 7 days and showing old virus definition version on home screen. I did some normal stuff to update SEPM but none of them helped. Every time i try to update it i was getting error messages as per below attached screenshot.

While troubleshooting, i found that LUALL.exe is not available and LiveUpdate is also not showing in "Programs And Features" in control panel. And Return Code = 2 is also saying about Live Update. So after more dig in it, i fixed it, below i am going to share all steps which i performed.

Microsoft lync keychain password pop-ups

Issue reported with fix Here and Here.

This issue is old and have been posted on many blogs, but i faced this issue first time with some of my users, not one or two. So i decided to create a script and made it available for users to use it if they are experiencing this problem.

Scrip: