In addition other possible solutions:
https://discussions.apple.com/thread/7682929
https://howchoo.com/g/yty3mdvkyty/how-to-download-apps-from-anywhere-in-macos-si...
In addition other possible solutions:
https://discussions.apple.com/thread/7682929
https://howchoo.com/g/yty3mdvkyty/how-to-download-apps-from-anywhere-in-macos-si...