Assuming that all the versions .1 - 2 - 3 -4 say "Includes all fixes in previous one" I am assuming I can go directly to install 18.104.22.168.4Yes, you are right. The latest PSU patch contains the fixes that were provided in the previous PSUs for the release. So, you can apply the latest PSU. The README file of the PSU patch must give you the required information.
Is this correct?