Installing the App Inventor Setup software package
You must perform the installation from an account that has administrator privileges . Installing via a non-administrator account is currently not supported.
If you have installed a previous version of the App Inventor 2 setup tools, you will need to uninstall them before installing the latest version. Follow the instructions at How to Update the App Inventor Setup Software.
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Download the installer.
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Locate the file MIT_Appinventor_Tools_2.3.0 (~80 MB) in your Downloads file or your Desktop. The location of the download on your computer depends on how your browser is configured.