On the computer

In the Build menu, click save .apk to my computer

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Now, AppInventor will build the app installation file:

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And at the end will ask us to save the file to a computer.

Once we have saved, we will send ourselves the file by email.

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On the phone

We will allow the installation of applications from an unknown source on the phone:

Settings ->  Security -> Enable the installation of applications from unknown sources

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We will enter the email we sent ourselves on the device and click on the attached apk file.

Click Install and the application is ready to use!

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