You must be able to enable "Developer Mode" within the Android Auto app settings.
Try a different USB cable or clear the cache of the Android Auto app. CarStream APK 2.0.6 Download -No Root- For Android
Open the Android Auto app on your phone. Scroll to the bottom and tap "Version" 10 times until a pop-up says developer mode is enabled. Open the three-dot menu in the top right, select "Developer settings," and check the box for "Unknown sources." Step 2: Download the APK You must be able to enable "Developer Mode"