A few people I know all have the same issue as me as shown. If you install software and the button to click is disappeared then its not an issue of the installation (I've tried this 3 times now). I'm using windows 10 but haven't tested with different OS to see if that might be the problem.
All communication settings must be done in Automation Builder, later when you open Codesys, it inherits the settings from the Automation Builder suite. Follow the advice of Dash or on youtube you can find tutorials for this type of settings