If you have attempted to install in5 and received this error message: "Not authorized to send Apple events to System Events"...
Here is a possible solution:
1. Select System Preferences (from the Apple Menu)
2. Click Security & Privacy
3. Select the Privacy Tab
4. Select Automation (you may need to scroll down)
5. Select the checkbox next to the "System Events.app" for the in5 - Mac Installer.app
In our internal testing, this solved the issue in February 2021 on a MacBook Pro running MacOS Catalina Version 10.15.7.