The blog post below contains a useful flowchart showing how to open a non-Mac App Store app on Catalina. https://eclecticlight.co/2019/10/04/will-gatekeeper-le

The blog post below contains a useful flowchart showing how to open a non-Mac App Store app on Catalina. https://eclecticlight.co/2019/10/04/will-gatekeeper-let-me-run-that-app-in-catalina/ https://eclecticlight.co/2019/10/04/will-gatekeeper-let-me-r... A follow-up post mentions that standard users will not see an Open button at all. https://eclecticlight.co/2019/10/05/what-to-do-when-a-newly-installed-app-cant-be-opened/ https://eclecticlight.co/2019/10/05/what-to-do-when-a-newly-...