The dism run ok, reboot and tried the KB4520005 again and it now installed fine, reboot, and also tried to install some recommended uptades and it also went fine, magic :)
Could you please explain what is happening in this process, how do you find what next KB to dism-add, and what could cause the problem from start?
We have a lot of reocuring wsus problem with many om the 2012 R2 servers.