Delphi 10.1 Berline Update 2 Installation

I used the web installer to uninstall update 1 and install update 2 which completed without error. Bizarrely, the platforms it wanted to install were not those that I had previously. Instead of Windows and macOS, it wanted to install Windows and iOS. Not a big deal, but curious none the less.

The macOS paserver application was missing after the installation - it was not to be found in c:\program files (x86)\Embarcadero\PAServer\18.0\

After searching for it on the web, I found an outdated link on the docwiki to http://altd.embarcadero.com/releases/studio/18.0/PAServer/Update1/PAServer18.0.pkg - trial and error suggested changing that to http://altd.embarcadero.com/releases/studio/18.0/PAServer/Update2/PAServer18.0.pkg which worked.

Why is an "update release" always a trial to get working?