I have had Windows Update disabled for a while - I don't want the next Creators update anywhere near my machine until the dust settles.
I enabled and successfully installed 16299.402.
After a 'hefty' update I normally wait for 24 hours and then do a Disk CleanUp including 'Clean up system files' and get back, sometimes, a few GB. The system, for some reason, does not like me doing this shortly after a 'hefty' update. However, sometimes the system locks and I have to Cancel. What happens is that the previous update files get in a mess and we have to 'clear the decks'. We can do this manually if we know where the files are, I have done it, but there is a utility which will do this for us and I have used it several times.
Go to WindowsUpdateFixer
and get a copy of V2.1.2. Run in admin mode and just click on 'Fix Windows Update' - do not switch to 'Advanced Mode'. This is not a Windows 10 specific utility - I used it on Windows 7 but I have had to use it too many times with Windows 10. Restart and try to install 16299.402 again.
I have tried the Windows Update troubleshooter in the past but found it totally useless, as with most of their troubleshooters.
I should add that I am not overly concerned about anything going pear shaped because I have a system backup done every morning at 04:00 when the system is a asleep. Anything untoward and I am straight back to the last 04:00 backup.
No guarantees but WindowsUpdateFixer is worth a try.
I have just disable Windows Update again, paused until May 31. The latest Creators should have come out on April 10 so we are getting close to the half yearly 'grief time'. <smile>