App Inventor setup issue on Mac OS El Capitan 10.11

After solving my problem with the installation of the emulator (thanks to Tim) I have a similar problem now on a Mac OS running El Capitan (10.11)
In fact the application App Inventor (version 3.0) gets installed but the emulator throws an error stating that this version was developed for Mac OS 10.12

    [703] Error loading Python lib '/var/folders/ct/96732t116dv653245y401gcw0000gn/T/_MEI7k1IFj/.Python': dlopen: dlopen(/var/folders/ct/96732t116dv653245y401gcw0000gn/T/_MEI7k1IFj/.Python, 10): Symbol not found: _getentropy
  Referenced from: /var/folders/ct/96732t116dv653245y401gcw0000gn/T/_MEI7k1IFj/.Python (which was built for Mac OS X 10.12)
  Expected in: /usr/lib/libSystem.B.dylib
 in /var/folders/ct/96732t116dv653245y401gcw0000gn/T/_MEI7k1IFj/.Python

Then I tried to install previous AI setup, version 2.3, but it crashes during instalation.
Therefore I am in the middle of no ones land!

Yes, that was an issue with version 3.0. There is version 3.0.1rc1 that should work on that particular version of macOS:

Hi Evan. Thanks to your link I have now an emulator (very nice, by the way!) that shows up but the App Inventor application starts trying to connect with AI Companion and after several count down retrials it throws an error.