At this stage of your linux experience, and using a debian distro (such as RaspberryPI OS) you should stick to package install-able applications (ie packaged as ***.deb), and specifically those provided / available from the OS provider. But this is kind of restrictive and as far as I’m aware processing is not available as a debian package, so you are at the mercy of the install script provided. Debian do provide a convenient tool for managing symbolic links update-alternatives which allows you to manage symbolic links, pity that the processing install script does not use it.