Following these instructions...
There is no Application ID Generator in App Library.
And where do i get it?
I just walked through the Quick Start and the "Application ID Generator" app is present. Can you confirm that after launching the "App Library" that you are typing in the search box "application id generator"? If so, can you provide your version of Eikon?
I don't see any reason why your shouldn't see Application ID Generator app in App Library. Try using the app URL. Copy & paste the following string into command/search bar in Eikon toolbar and hit Enter. Let me know what happens.