"2. Install 1.4 (full) patch (Required)"
This file would not install, it errored out.
I found an copy of the same patch file on my old XP box, and it also failed to install on my new box.
I'm figuring it to be a Windows 10 thingy.
"5. Delete the pb folder inside your "Return to Castle Wolfenstein" folder.
6. Download the RTCW Punkbuster files:
All versions: http://stats.ecgnetwork.co/rtcw_files/pb/rtcw-pb.zip
Unzip this file and place the pb folder inside your "Return to Castle Wolfenstein" install folder.
7. Download PBSVC.http://www.evenbalance.com/downloads/pbsvc/pbsvc.exe
Right-click on exe and choose 'Run As Administrator' (On Windows Vista and higher)"
For me, that was the key.
RTCW is drag and drop (old to new Windows version). The problem is Punkbuster for multiplayer.
Dragging and dropping a copy of my old RTCW directory to my new computer, and reinstalling Punkbuster, using rtcw-pb.zip and pbsvc.exe worked great.
My concern is for new players, who do not have an old, working copy of RTCW. The 1.4 patch is problematlic (at least on my Skylake/Windows 10 box).