Sideload apps not on App Store
From AppleGamingWiki, the wiki about gaming on M1 Apple silicon Macs
Sideloading history
Sideloading is last enabled in macOS 11.2. Sideloading was disabled in macOS 11.3 beta and in the current macOS 11.3 full release. If one attempts to sideload an app, the erorr message "This application cannot be installed because the developer did not intend for it to run on this platform" appears.
Sideload with an iPhone or iPad
iMazing
Apple Configurator 2
- Download Apple Configurator 2 from App Store
- Connect iPhone or iPad via USB cable
- Use Apple Configurator 2 and click Add and then Apps
- Sign into Apple ID
- Find app to download, select and Add
- A message will appear to 'Skip App', 'Replace' or 'Stop' - do nothing
- Open Finder and navigate to
~/Library/Group Containers/K36BKF7T3D.group.com.apple.configurator/Library/Caches/Assets/TemporaryItems/MobileApps/
and locate the app IPA that has been download - Open Terminal and then copy and paste the command
sudo xattr -rd com.apple.quarantine
- Then drag the app IPA after this code (so that the path appears afterwards)
- Press return
- Double click on app IPA to install, which will then appear in Applications folder