Cannot build the application neither for Android not for iOS

Hi,
I created a sample application which works just playing it in Unity. Now I tried to build the android application in Unity. For that I downloaded UnitySetup-Android-Support-for-Editor-5.6.2f1.pkg but installation of it failes. Please see the attached screenshot. I get the same result while trying building the app for iOS.
Can anyone help me?
//Piotr

How to contact the manufacturer, can’t find any mail address to Unity

Do you have SDK, JDK, and NDK installed? Update?
Check edit > preferences > external tools, then look for those 3.