Hi @Misaki! Thanks for the response. But no, it is not working that way. There isn't any Spine.app in the /Applications folder. This is very strange. I have only 1 year of experience with macOS, but this is the first time I have had an issue with the installation of an app. I don't know if Spine ESS has a particular requirement different from the SpineTrial app. Maybe I should change a setting in macOS about the installation of background services or something like that.
Look this command:
arian@Arians-MacBook-Pro ~ % pkgutil --pkgs | grep Spine
com.esotericsoftware.spine.Spine
It says the Spine package is installed... but where?