Ich habe das *.APK File installiert. Das wird in Side Quest auch als "Erfolgreich" angezeigt aber ich finde die APP auf der Quest in "unbekannte Quellen" nicht. was kann ich tun?
You didn't find QGO in the unknown sources section, or you don't see the unknown sources section ?
It this is the first statement, I assume you previously had a QGO version installed in your headset ? And you uninstalled it. Am I right ?
Sometimes when you uninstall an app from meta menu, the app is not really removes by the Meta Quest system (don't ask me why)
So you need to perform a clean uninstallation (with sidequest PC app) => see the FAQ : https://anagan79.itch.io/quest-games-optimizer/devlog/538649/questions-answers
Then restart the Quest then install QGO again