The homebrew launcher doesn't really work on aroma since your homebrew apps are all on the wii u homescreen but just create a folder named homebrew launcher and put your homebrew apps in there

in case you have the wup intaller in the main menu, try reinstalling the homebrew launcher from here

I don't have the wup installer in my main menu and I needed to use that for something anyway but when I try to go to the homebrew launcher on tiramisu it gives me -11 (It used to work before) and I think that's an error code I don't know